add gas token && deploy kovan script

contracts/SmartRoute/intf/IChi.sol

@@ -0,0 +1,13 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+interface IChi {
+    function freeUpTo(uint256 value) external returns (uint256);
+}