added missing files

src/contracts/oracles/PendlePTRelayer.sol

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+// SPDX-License-Identifier: GPL-3.0
+pragma solidity ^0.8.17;
+
+import '@pendle/contracts/oracles/PendlePYLpOracle.sol';
+import '@pendle/contracts/interfaces/IPAllActionV3.sol';
+import '@pendle/contracts/interfaces/IPMarket.sol';
+import '@interfaces/oracles/IBaseOracle.sol';
+import {IERC20Metadata} from '@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol';
+
+/**
+ * @title  PendleRelayer
+ * @notice This contracts transforms a Pendle TWAP price feed into a standard IBaseOracle feed
+ *
+ */
+contract PendlePTRelayer is IBaseOracle {
+  using PendlePYOracleLib for IPMarket;
+  using PendleLpOracleLib for IPMarket;
+
+  IStandardizedYield public SY;
+  IPPrincipalToken public PT;
+  IPYieldToken public YT;
+
+  IPMarket public market;
+  PendlePYLpOracle public oracle;
+
+  uint32 public twapDuration;
+
+  string public symbol;
+
+  constructor(address _market, address _oracle, uint32 _twapDuration) {
+    require(_market != address(0) && _oracle != address(0), 'Invalid address');
+    require(twapDuration != 0, 'Invalid TWAP duration');
+
+    market = IPMarket(_market);
+    oracle = PendlePYLpOracle(_oracle);
+    twapDuration = _twapDuration;
+
+    (SY, PT, YT) = market.readTokens();
+
+    // test if oracle is ready
+    (bool increaseCardinalityRequired,, bool oldestObservationSatisfied) = oracle.getOracleState(_market, _twapDuration);
+    // It's required to call IPMarket(market).increaseObservationsCardinalityNext(cardinalityRequired) and wait
+    // for at least the twapDuration, to allow data population.
+    // also
+    // It's necessary to wait for at least the twapDuration, to allow data population.
+    require(!increaseCardinalityRequired && oldestObservationSatisfied, 'Oracle not ready');
+    symbol = string(abi.encodePacked(IERC20Metadata(_market).symbol()));
+  }
+  //
+
+  function getResultWithValidity() external view returns (uint256 _result, bool _validity) {
+    _result = oracle.getPtToSyRate(address(market), twapDuration);
+
+    //TODO check valid TWAP duration
+    _validity = true;
+  }
+
+  // returns value of PT denominated in SY(underlying asset)
+
+  function read() external view returns (uint256 _value) {
+    _value = oracle.getPtToSyRate(address(market), twapDuration);
+  }
+}

src/interfaces/pendle/IPMarket.sol

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+// SPDX-License-Identifier: GPL-3.0
+pragma solidity ^0.8.17;
+
+interface IPMarket {
+    function
+}