Add Multicall module

contracts/utils/BatchCall.sol

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.0;
+
+import "./Address.sol";
+
+/*
+ * @dev Provides a way to batch together multiple function calls in a single external call.
+ */
+abstract contract BatchCall {
+   function batchcall(bytes[] calldata data) external returns(bytes[] memory results) {
+        results = new bytes[](data.length);
+        for (uint i = 0; i < data.length; i++) {
+            bytes memory result = Address.functionDelegateCall(address(this), data[i]);
+            results[i] = result;
+        }
+        return results;
+    }
+}