add: events and interface

contracts/optimism/connectors/connext/events.sol

@@ -0,0 +1,14 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+contract Events {
+	event LogXCall(
+    uint32 destination,
+    address to,
+    address asset,
+    address delegate,
+    uint256 amount,
+    uint256 slippage,
+		uint256 getId
+	);
+}

contracts/optimism/connectors/connext/interface.sol

@@ -0,0 +1,30 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+interface IConnext {
+  function xcall(
+    uint32 _destination,
+    address _to,
+    address _asset,
+    address _delegate,
+    uint256 _amount,
+    uint256 _slippage,
+    bytes calldata _callData
+  ) external payable returns (bytes32);
+}
+
+interface IInstaReceiver {
+  function withdraw(
+    address _asset,
+    uint256 _amount
+  ) external returns (bytes memory);
+
+  function xReceive(
+    bytes32 _transferId,
+    uint256 _amount,
+    address _asset,
+    address _originSender,
+    uint32 _origin,
+    bytes memory _callData
+  ) external returns (bytes memory);
+}