add uniV3RouteAdapter

contracts/SmartRoute/intf/IUniV3.sol

@@ -0,0 +1,12 @@
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+interface IUniV3 {
+    function swap(
+        address recipient,
+        bool zeroForOne,
+        int256 amountSpecified,
+        uint160 sqrtPriceLimitX96,
+        bytes calldata data
+    ) external returns (int256 amount0, int256 amount1);
+}

contracts/SmartRoute/intf/IUniswapV3SwapCallBack.sol

@@ -0,0 +1,20 @@
+pragma solidity 0.6.9;
+
+/// @title Callback for IUniswapV3PoolActions#swap
+/// @notice Any contract that calls IUniswapV3PoolActions#swap must implement this interface
+interface IUniswapV3SwapCallback {
+    /// @notice Called to `msg.sender` after executing a swap via IUniswapV3Pool#swap.
+    /// @dev In the implementation you must pay the pool tokens owed for the swap.
+    /// The caller of this method must be checked to be a UniswapV3Pool deployed by the canonical UniswapV3Factory.
+    /// amount0Delta and amount1Delta can both be 0 if no tokens were swapped.
+    /// @param amount0Delta The amount of token0 that was sent (negative) or must be received (positive) by the pool by
+    /// the end of the swap. If positive, the callback must send that amount of token0 to the pool.
+    /// @param amount1Delta The amount of token1 that was sent (negative) or must be received (positive) by the pool by
+    /// the end of the swap. If positive, the callback must send that amount of token1 to the pool.
+    /// @param data Any data passed through by the caller via the IUniswapV3PoolActions#swap call
+    function uniswapV3SwapCallback(
+        int256 amount0Delta,
+        int256 amount1Delta,
+        bytes calldata data
+    ) external;
+}