Update README.md

Updated detailed documentation for Contract transaction with ABI string

Author: RaviRanjan-11

README.md

@@ -141,10 +141,10 @@ options.from = walletAddress
 options.gasPrice = .automatic
 options.gasLimit = .automatic
 let tx = contract.write(
-    "fallback",
-    parameters: [AnyObject](),
-    extraData: Data(),
-    transactionOptions: options)!
+"fallback",
+parameters: [AnyObject](),
+extraData: Data(),
+transactionOptions: options)!
 ```
 
 ##### Send ERC-20 Token
@@ -164,10 +164,10 @@ options.gasPrice = .automatic
 options.gasLimit = .automatic
 let method = "transfer"
 let tx = contract.write(
-    method,
-    parameters: [toAddress, amount] as [AnyObject],
-    extraData: Data(),
-    transactionOptions: options)!
+method,
+parameters: [toAddress, amount] as [AnyObject],
+extraData: Data(),
+transactionOptions: options)!
 ```
 
 
@@ -199,12 +199,103 @@ options.from = walletAddress
 options.gasPrice = .automatic
 options.gasLimit = .automatic
 let tx = contract.write(
-    contractMethod,
-    parameters: parameters,
-    extraData: extraData,
-    transactionOptions: options)!
+contractMethod,
+parameters: parameters,
+extraData: extraData,
+transactionOptions: options)!
 ```
 
+
+#####  Write Transaction with your custom contract ABI
+### Requirement : Your custom contract ABI string
+```Code
+
+let yourCoin = self.yourbalance.text ?? "0.0" //Get token for sending
+let userDir = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] //get user directory for keystore
+if (FileManager.default.fileExists(atPath: userDir + "/keystore/key.json")) {
+//Create Keystore
+guard let manager = FilestoreWrapper.getKeystoreManager() else {
+print("Manager not found ")
+return
+}
+wethioKeystoreManager = manager 
+guard let urlStr = URL(string: "Your rpc url here") else { return }
+guard let kManager = yourKeystoreManager else { return }
+/*
+Create Web3Provider Instance with key manager
+*/
+web3ProvideInstance = Web3HttpProvider(urlStr, keystoreManager: kManager)
+guard let wProvier = self.web3ProvideInstance else {return}
+self.web3Instance = Web3(provider: wProvier) //Set provide instance with web3
+guard let wInstance = self.web3Instance else {return}
+self.receiverAddressString = self.walletAddressTF.text //get receiver address string
+print("Receiver address is : ", self.receiverAddressString ?? " ")
+self.etheriumAccountAddress = self.wethioKeystoreManager?.addresses.first?.address  //get sender address in string
+/*
+convert address string into etherium addresss
+*/
+let senderEthAddress = EthereumAddress(self.etheriumAccountAddress ?? "")
+DispatchQueue.global(qos: .background).async {
+do {
+/*
+Convert receiver address in to etherium address
+*/
+let toaddress = EthereumAddress(self.receiverAddressString ?? "")
+/*
+Create web3 options
+*/
+var options = Web3Options.defaultOptions()
+/*
+Convert amount into BIGINT
+*/
+let amountDouble = BigInt((Double(yourCoin) ?? 0.1)*pow(10, 18))
+/*
+Here i am using 0.1 as an default value please use validation for amount (coin or token)  
+*/
+print("Total amount in double value : ", amountDouble)
+/*
+Convert amount in BIG UI iNt
+*/
+var amount = BigUInt.init(amountDouble)
+/*
+get gas price
+*/
+let estimateGasPrice = try wInstance.eth.getGasPrice()
+guard let eGasReult = self.estimatedGasResult else {
+print("Unable to find gas price")
+return
+}
+/*
+Get nonce
+*/
+let nonce = try wInstance.eth.getTransactionCount(address: senderEthAddress)
+print("Is the Transaction count", nonce)
+let fee = estimateGasPrice * eGasReult
+/*
+adding
+- sender address
+- Gas Result
+- Gas price
+- amount
+*/
+var sendTransactionIntermediateOptions = Web3Options.defaultOptions()
+sendTransactionIntermediateOptions.from = senderEthAddress
+sendTransactionIntermediateOptions.gasLimit = eGasReult
+sendTransactionIntermediateOptions.gasPrice = estimateGasPrice
+
+var tokenTransactionIntermediate: TransactionIntermediate!
+tokenTransactionIntermediate = try wInstance.contract("Your custom contract ABI string", at: contractAddress).method("transfer", args: toaddress, amount, options: sendTransactionIntermediateOptions)
+
+let mainTransaction = try tokenTransactionIntermediate.send(options: sendTransactionIntermediateOptions, onBlock: "latest")
+
+print(mainTransaction.hash, "is the hash")
+}
+```
+
+
+
+
+
 ### Web3View example
 
 You can see how to our demo project: **WKWebView with injected "web3" provider**:
@@ -237,7 +328,7 @@ For full documentation details and FAQ, please look at [Documentation](https://g
 
 *If you need to find or understand an API, check [Usage.md](https://github.com/matter-labs/web3swift/blob/master/Documentation/Usage.md).*
 
- **FAQ moved [Documentation Page](https://github.com/matter-labs/web3swift/blob/master/Documentation/)**
+**FAQ moved [Documentation Page](https://github.com/matter-labs/web3swift/blob/master/Documentation/)**
 
 Here are quick references for essential features:
 
@@ -311,7 +402,7 @@ You are more than welcome to participate! **Your contribution will be paid via
 
 - [ ] Convenient methods for namespaces
 
-  
+
 
 ## Credits
 
@@ -327,3 +418,4 @@ If you believe you have identified a security vulnerability with web3swift, you
 ## License
 
 web3swift is available under the Apache License 2.0 license. See the [LICENSE](https://github.com/matter-labs/web3swift/blob/master/LICENSE) for details.
+