feat: add G3MStrategy wip

contracts/strategies/G3MStrategy.sol

@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+pragma solidity 0.8.19;
+
+import "./IG3MStrategy.sol";
+
+contract G3MStrategy is IG3MStrategy {
+    function afterCreate(
+        uint64 poolId,
+        bytes calldata strategyArgs
+    ) external returns (bool success) { }
+
+    function beforeSwap(
+        uint64 poolId,
+        bool sellAsset,
+        address swapper
+    ) external returns (bool, int256) { }
+
+    function validateSwap(
+        uint64 poolId,
+        int256 invariant,
+        uint256 reserveX,
+        uint256 reserveY
+    ) external view returns (bool, int256) { }
+
+    function getAmountOut(
+        uint64 poolId,
+        bool sellAsset,
+        uint256 amountIn,
+        address swapper
+    ) external view returns (uint256) { }
+
+    function getSpotPrice(uint64 poolId)
+        external
+        view
+        returns (uint256 price)
+    { }
+
+    function getMaxOrder(
+        uint64 poolId,
+        bool sellAsset,
+        address swapper
+    ) external view returns (Order memory) { }
+
+    function simulateSwap(
+        Order memory order,
+        uint256 timestamp,
+        address swapper
+    )
+        external
+        view
+        returns (bool success, int256 prevInvariant, int256 postInvariant)
+    { }
+
+    function getInvariant(uint64 poolId) external view returns (int256) { }
+
+    function validatePool(uint64 poolId)
+        external
+        view
+        override
+        returns (bool)
+    { }
+}