cocktail-dkg: add v0.2.0 test vectors

cocktail-dkg/README.md

@@ -6,3 +6,41 @@ The test vectors are generated from a SHA256 hash of the spec co-maintainers' na
 Each of these assume a 2-of-3 threshold.
 
 These are current as of v0.1.0 of the cocktail-dkg spec. 
+
+## Test Vector Types
+
+Each JSON file contains multiple test vectors:
+
+1. **2-of-3 basic**: Standard 2-of-3 DKG with empty extension
+2. **3-of-5 basic**: Standard 3-of-5 DKG with empty extension
+3. **7-of-14 basic**: Standard 7-of-14 DKG with empty extension
+4. **2-of-3 with payload extension**: 2-of-3 DKG where each participant includes a seed-derived payload, and the 
+   extension is a hash of all payloads
+
+## JSON Structur
+
+Each vector includes:
+
+- `name`: Descriptive name for the test case
+- `n`: Total number of participants
+- `t`: Threshold
+- `context`: Context string (hex-encoded)
+- `extension`: Application-specific extension (hex-encoded, empty string if none)
+- `payloads`: (Optional) Array of hex-encoded payloads for each participant
+- `config`: Static keys for all participants
+- `round1`: Ephemeral keys, VSS commitments, PoPs, and encrypted shares
+- `round2`: Secret shares and verification shares
+- `round3`: Transcript hash and signatures
+- `group_public_key`: Final group public key
+
+## Ciphersuites
+
+| File                                    | Ciphersuite                      |
+|-----------------------------------------|----------------------------------|
+| `cocktail-dkg-ristretto255-sha512.json` | COCKTAIL(Ristretto255, SHA-512)  |
+| `cocktail-dkg-ed25519-sha512.json`      | COCKTAIL(Ed25519, SHA-512)       |
+| `cocktail-dkg-p256-sha256.json`         | COCKTAIL(P-256, SHA-256)         |
+| `cocktail-dkg-secp256k1-sha256.json`    | COCKTAIL(secp256k1, SHA-256)     |
+| `cocktail-dkg-ed448-shake256.json`      | COCKTAIL(Ed448, SHAKE256)        |
+| `cocktail-dkg-jubjub-blake2b512.json`   | COCKTAIL(JubJub, BLAKE2b-512)    |
+| `cocktail-dkg-pallas-blake2b512.json`   | COCKTAIL(Pallas, BLAKE2b-512)    |