feat: Add smart-contract code

Signed-off-by: yashrajdesai <yashrajdesai30@gmail.com>

Author: yashrajdesai

example/smart-contract/getTransactions.sol

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: Apache-2.0
+pragma solidity >=0.7.0 <0.9.0;
+
+contract Transaction {
+    address public serviceContractAddress;
+
+    // Initializing service contract address in constructor
+    constructor() {
+        serviceContractAddress = 0xA6Abc17819738299B3B2c1CE46d55c74f04E290C;
+    }
+
+    // Queries the balance in _asset of an Iroha _account
+    function getAccountTransactions(string memory _account, string memory _pageSize, string memory _firstTxHash, string memory _firstTxTime, string memory _lastTxTime, string memory _firstTxHeight, string memory _lastTxHeight, string memory _ordering) public returns (bytes memory result) {
+        bytes memory payload = abi.encodeWithSignature(
+            "getAccountTransactions(string,string,string,string,string,string,string,string)",
+            _account,
+            _pageSize,
+            _firstTxHash,
+            _firstTxTime,
+            _lastTxTime,
+            _firstTxHeight,
+            _lastTxHeight,
+            _ordering);
+        (bool success, bytes memory ret) = address(serviceContractAddress).delegatecall(payload);
+        require(success, "Error calling service contract function");
+        result = ret;
+    }
+
+    function getAccountAssetTransactions(string memory _account, string memory _asset, string memory _pageSize, string memory _firstTxHash, string memory _firstTxTime, string memory _lastTxTime, string memory _firstTxHeight, string memory _lastTxHeight, string memory _ordering) public returns (bytes memory result) {
+        bytes memory payload = abi.encodeWithSignature(
+            "getAccountAssetTransactions(string,string,string,string,string,string,string,string,string)",
+            _account,
+            _asset,
+            _pageSize,
+            _firstTxHash,
+            _firstTxTime,
+            _lastTxTime,
+            _firstTxHeight,
+            _lastTxHeight,
+            _ordering);
+        (bool success, bytes memory ret) = address(serviceContractAddress).delegatecall(payload);
+        require(success, "Error calling service contract function");
+        result = ret;
+    }
+    function getPendingTransactions(string memory _pageSize, string memory _firstTxHash, string memory _firstTxTime, string memory _lastTxTime, string memory _ordering) public returns (bytes memory result) {
+        bytes memory payload = abi.encodeWithSignature(
+            "getPendingTransactions(string,string,string,string,string)",
+            _pageSize,
+            _firstTxHash,
+            _firstTxTime,
+            _lastTxTime,
+            _ordering);
+        (bool success, bytes memory ret) = address(serviceContractAddress).delegatecall(payload);
+        require(success, "Error calling service contract function");
+        result = ret;
+    }
+
+    function getTransactions(string memory hash) public returns (bytes memory result) {
+        bytes memory payload = abi.encodeWithSignature(
+            "getTransactions(string)",
+            hash);
+        (bool success, bytes memory ret) = address(serviceContractAddress).delegatecall(payload);
+        require(success, "Error calling service contract function");
+        result = ret;
+    }
+}