Initial commit: add .gitignore and README

contracts/interfaces/IAavePool.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+interface IAavePool {
+    function supply(
+        address asset,
+        uint256 amount,
+        address onBehalfOf,
+        uint16 referralCode
+    ) external;
+
+    function withdraw(
+        address asset,
+        uint256 amount,
+        address to
+    ) external returns (uint256);
+
+    function borrow(
+        address asset,
+        uint256 amount,
+        uint256 interestRateMode,
+        uint16 referralCode,
+        address onBehalfOf
+    ) external;
+
+    function repay(
+        address asset,
+        uint256 amount,
+        uint256 rateMode,
+        address onBehalfOf
+    ) external returns (uint256);
+
+    function setUserUseReserveAsCollateral(
+        address asset,
+        bool useAsCollateral
+    ) external;
+
+    function flashLoanSimple(
+        address receiverAddress,
+        address asset,
+        uint256 amount,
+        bytes calldata params,
+        uint16 referralCode
+    ) external;
+
+    function flashLoan(
+        address receiverAddress,
+        address[] calldata assets,
+        uint256[] calldata amounts,
+        uint256[] calldata modes,
+        address onBehalfOf,
+        bytes calldata params,
+        uint16 referralCode
+    ) external;
+}
+
+interface IFlashLoanReceiver {
+    function executeOperation(
+        address asset,
+        uint256 amount,
+        uint256 premium,
+        address initiator,
+        bytes calldata params
+    ) external returns (bool);
+}
+

contracts/interfaces/IERC20.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+interface IERC20 {
+    function totalSupply() external view returns (uint256);
+
+    function balanceOf(address account) external view returns (uint256);
+
+    function transfer(address to, uint256 amount) external returns (bool);
+
+    function allowance(address owner, address spender) external view returns (uint256);
+
+    function approve(address spender, uint256 amount) external returns (bool);
+
+    function transferFrom(address from, address to, uint256 amount) external returns (bool);
+}
+