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doc: Add example for VP with LD proof.
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‎README.md‎

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## Examples
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* [examples-ldp.md](examples-ldp.md) - Examples of Verifiable Credentials with Linked Data Proofs
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* [examples-ldp-vp.md](examples-ldp-vp.md) - Examples of Verifiable Presentations with Linked Data Proofs
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* [examples-jwt.md](examples-jwt.md) - Examples of Verifiable Credentials with JSON Web Tokens
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* [examples-jwt-vp.md](examples-jwt-vp.md) - Examples of Verifiable Presentations with JSON Web Tokens
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‎examples-jwt-vp.md‎

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### Example code (signing)
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Map<String, Object> claims = new LinkedHashMap<>();
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Map<String, Object> degree = new LinkedHashMap<String, Object>();
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degree.put("name", "Bachelor of Science and Arts");
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degree.put("type", "BachelorDegree");
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claims.put("college", "Test University");
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claims.put("degree", degree);
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CredentialSubject credentialSubject = CredentialSubject.builder()
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.id(URI.create("did:example:ebfeb1f712ebc6f1c276e12ec21"))
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.claims(claims)
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.build();
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VerifiableCredential verifiableCredential = VerifiableCredential.builder()
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.context(VerifiableCredentialContexts.JSONLD_CONTEXT_W3C_2018_CREDENTIALS_EXAMPLES_V1)
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.type("UniversityDegreeCredential")
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.id(URI.create("http://example.edu/credentials/3732"))
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.issuer(URI.create("did:example:76e12ec712ebc6f1c221ebfeb1f"))
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.issuanceDate(JsonLDUtils.stringToDate("2019-06-16T18:56:59Z"))
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.expirationDate(JsonLDUtils.stringToDate("2019-06-17T18:56:59Z"))
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.credentialSubject(credentialSubject)
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.build();
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byte[] testEd25519PrivateKey = Hex.decodeHex("984b589e121040156838303f107e13150be4a80fc5088ccba0b0bdc9b1d89090de8777a28f8da1a74e7a13090ed974d879bf692d001cddee16e4cc9f84b60580".toCharArray());
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JwtVerifiableCredential jwtVerifiableCredential = ToJwtConverter.toJwtVerifiableCredential(verifiableCredential);
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String jwtPayload = jwtVerifiableCredential.getPayload().toString();
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System.out.println(jwtPayload);
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String jwtString = jwtVerifiableCredential.sign_Ed25519_EdDSA(testEd25519PrivateKey);
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System.out.println(jwtString);
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JwtVerifiablePresentation jwtVerifiablePresentation = JwtVerifiablePresentation.fromJwtVerifiableCredential(jwtVerifiableCredential);
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String jwtPayload2 = jwtVerifiablePresentation.getPayload().toString();
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System.out.println(jwtPayload2);
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String jwtString2 = jwtVerifiablePresentation.sign_Ed25519_EdDSA(testEd25519PrivateKey);
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System.out.println(jwtString2);
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Map<String, Object> claims = new LinkedHashMap<>();
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Map<String, Object> degree = new LinkedHashMap<String, Object>();
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degree.put("name", "Bachelor of Science and Arts");
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degree.put("type", "BachelorDegree");
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claims.put("college", "Test University");
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claims.put("degree", degree);
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CredentialSubject credentialSubject = CredentialSubject.builder()
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.id(URI.create("did:example:ebfeb1f712ebc6f1c276e12ec21"))
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.claims(claims)
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.build();
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VerifiableCredential verifiableCredential = VerifiableCredential.builder()
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.context(VerifiableCredentialContexts.JSONLD_CONTEXT_W3C_2018_CREDENTIALS_EXAMPLES_V1)
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.type("UniversityDegreeCredential")
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.id(URI.create("http://example.edu/credentials/3732"))
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.issuer(URI.create("did:example:76e12ec712ebc6f1c221ebfeb1f"))
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.issuanceDate(JsonLDUtils.stringToDate("2019-06-16T18:56:59Z"))
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.expirationDate(JsonLDUtils.stringToDate("2019-06-17T18:56:59Z"))
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.credentialSubject(credentialSubject)
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.build();
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byte[] testEd25519PrivateKey = Hex.decodeHex("984b589e121040156838303f107e13150be4a80fc5088ccba0b0bdc9b1d89090de8777a28f8da1a74e7a13090ed974d879bf692d001cddee16e4cc9f84b60580".toCharArray());
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JwtVerifiableCredential jwtVerifiableCredential = ToJwtConverter.toJwtVerifiableCredential(verifiableCredential);
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String jwtPayload = jwtVerifiableCredential.getPayload().toString();
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System.out.println(jwtPayload);
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String jwtString = jwtVerifiableCredential.sign_Ed25519_EdDSA(testEd25519PrivateKey);
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System.out.println(jwtString);
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JwtVerifiablePresentation jwtVerifiablePresentation = JwtVerifiablePresentation.fromJwtVerifiableCredential(jwtVerifiableCredential);
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String jwtPayload2 = jwtVerifiablePresentation.getPayload().toString();
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System.out.println(jwtPayload2);
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String jwtString2 = jwtVerifiablePresentation.sign_Ed25519_EdDSA(testEd25519PrivateKey);
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System.out.println(jwtString2);

‎examples-ldp-vp.md‎

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## Examples
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Verifiable Presentations with Linked Data Proofs:
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### Example Verifiable Presentation
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{
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"@context" : [ "https://www.w3.org/2018/credentials/v1" ],
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"type" : [ "VerifiablePresentation" ],
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"holder" : "did:key:z6MkwBZ6oiJ71ovCohPfdsgBrQinMXnFn6wJxVZHpZEpSh8x",
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"verifiableCredential" : {
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"@context" : [ "https://www.w3.org/2018/credentials/v1", "https://www.w3.org/2018/credentials/examples/v1" ],
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"type" : [ "VerifiableCredential", "UniversityDegreeCredential" ],
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"id" : "http://example.edu/credentials/3732",
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"issuer" : "did:example:76e12ec712ebc6f1c221ebfeb1f",
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"issuanceDate" : "2019-06-16T18:56:59Z",
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"expirationDate" : "2019-06-17T18:56:59Z",
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"credentialSubject" : {
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"id" : "did:example:ebfeb1f712ebc6f1c276e12ec21",
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"college" : "Test University",
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"degree" : {
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"name" : "Bachelor of Science and Arts",
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"type" : "BachelorDegree"
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}
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},
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"proof" : {
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"type" : "Ed25519Signature2018",
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"created" : "2021-11-17T22:43:04Z",
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"proofPurpose" : "assertionMethod",
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"verificationMethod" : "did:example:76e12ec712ebc6f1c221ebfeb1f#keys-1",
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"jws" : "eyJiNjQiOmZhbHNlLCJjcml0IjpbImI2NCJdLCJhbGciOiJFZERTQSJ9..jbhZsH1jylvuZLov502qhTRkYvgbepU8ds8Mbgf4X7dhVp8F1P89Ql5WMA2DQEJxMGsVlaT8plfSY0JUw6XmDg"
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}
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},
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"proof" : {
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"type" : "Ed25519Signature2018",
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"created" : "2021-11-17T22:43:05Z",
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"domain" : "example.com",
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"nonce" : "343s$FSFDa-",
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"proofPurpose" : "assertionMethod",
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"verificationMethod" : "did:key:z6MkwBZ6oiJ71ovCohPfdsgBrQinMXnFn6wJxVZHpZEpSh8x#z6MkwBZ6oiJ71ovCohPfdsgBrQinMXnFn6wJxVZHpZEpSh8x",
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"jws" : "eyJiNjQiOmZhbHNlLCJjcml0IjpbImI2NCJdLCJhbGciOiJFZERTQSJ9..D9T1iZ6bF_do_xFhYWjb3HVicP0NvpaKrBrE6K8ZpReEE1UUj5iV6prkj81bilovcRZ9FZpVmq_Gq3mDfIfnBg"
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}
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}
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### Example code (signing)
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VerifiablePresentation verifiablePresentation = VerifiablePresentation.builder()
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.verifiableCredential(verifiableCredential)
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.build();
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byte[] testEd25519PrivateKey2 = Hex.decodeHex("984b589e121040156838303f107e13150be4a80fc5088ccba0b0bdc9b1d89090de8777a28f8da1a74e7a13090ed974d879bf692d001cddee16e4cc9f84b60580".toCharArray());
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Ed25519Signature2018LdSigner signer2 = new Ed25519Signature2018LdSigner(testEd25519PrivateKey2);
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signer2.setCreated(new Date());
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signer2.setProofPurpose(LDSecurityKeywords.JSONLD_TERM_ASSERTIONMETHOD);
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signer2.setVerificationMethod(URI.create("did:example:45678#keys-1"));
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signer2.setDomain("example.com");
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signer2.setNonce("343s$FSFDa-");
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LdProof ldProof2 = signer2.sign(verifiablePresentation);
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System.out.println(verifiablePresentation.toJson(true));
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### Example code (verifying)
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byte[] testEd25519PublicKey = Hex.decodeHex("f890ab605908a65b89b926fba3b540c0132ce147e3dc5da9fbe7f1445d7279e5".toCharArray());
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VerifiablePresentation verifiablePresentation = VerifiablePresentation.fromJson(new FileReader("input.jsonld"));
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Ed25519Signature2018LdVerifier verifier = new Ed25519Signature2018LdVerifier(testEd25519PublicKey);
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System.out.println(verifier.verify(verifiablePresentation));

‎examples-ldp.md‎

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Verifiable Credentials with Linked Data Proofs:
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### Example Verifiable Credential
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{
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"@context" : [ "https://www.w3.org/2018/credentials/v1", "https://www.w3.org/2018/credentials/examples/v1" ],
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"type" : [ "VerifiableCredential", "UniversityDegreeCredential" ],
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### Example code (verifying)
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byte[] testEd25519PublicKey = Hex.decodeHex("de8777a28f8da1a74e7a13090ed974d879bf692d001cddee16e4cc9f84b60580".toCharArray());
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VerifiableCredential verifiableCredential = VerifiableCredential.fromJson(new FileReader("input.jsonld"));
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Ed25519Signature2018LdVerifier verifier = new Ed25519Signature2018LdVerifier(testEd25519PublicKey);
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System.out.println(verifier.verify(verifiableCredential));

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