feat: add crv gauge oracle

src/curve/Stable2CurveGaugeOracle.sol

@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.15;
+
+import {IOracle} from "../core/IOracle.sol";
+
+interface IGauge {
+    function lp_token() external view returns (address);
+}
+
+/**
+    @title Stable 2 curve gauge oracle
+    @notice Price Oracle for 2 curve stable gauge
+*/
+contract Stable2CurveGaugeOracle is IOracle {
+
+    /* -------------------------------------------------------------------------- */
+    /*                               STATE VARIABLES                              */
+    /* -------------------------------------------------------------------------- */
+
+    /// @notice Oracle Facade
+    IOracle immutable oracleFacade;
+
+    /* -------------------------------------------------------------------------- */
+    /*                                 CONSTRUCTOR                                */
+    /* -------------------------------------------------------------------------- */
+
+    /**
+        @notice Contract constructor
+        @param _oracle Address of oracleFacade
+    */
+    constructor(IOracle _oracle) {
+        oracleFacade = _oracle;
+    }
+
+    /* -------------------------------------------------------------------------- */
+    /*                              PUBLIC FUNCTIONS                              */
+    /* -------------------------------------------------------------------------- */
+
+    /// @inheritdoc IOracle
+    function getPrice(address token) external view returns (uint) {
+        return oracleFacade.getPrice(IGauge(token).lp_token());
+    }
+}