Add ApproveERC20Encode

Trust/Vendors/New Group/Commands/ApproveERC20.swift

@@ -0,0 +1,18 @@
+// Copyright SIX DAY LLC. All rights reserved.
+
+import Foundation
+
+
+struct ApproveERC20Encode: Web3Request {
+    typealias Response = String
+
+    static let abi = "{\"constant\":false,\"inputs\":[{\"name\":\"_spender\",\"type\":\"address\"},{\"name\":\"_amount\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"name\":\"success\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"}"
+
+    let address: Address
+    let amount: String
+
+    var type: Web3RequestType {
+        let run = "web3.eth.abi.encodeFunctionCall(\(ApproveERC20Encode.abi), [\"\(address.address)\", \"\(amount)\"])"
+        return .script(command: run)
+    }
+}