update remappings and add contract starter

Author: divine-comedian

remappings.txt

@@ -3,3 +3,6 @@ halmos-cheatcodes=node_modules/halmos-cheatcodes
 
 contracts/=src/contracts
 interfaces/=src/interfaces
+
+@openzeppelin/contracts/=lib/openzeppelin-contracts-upgradeable/lib/openzeppelin-contracts/contracts/
+@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/

src/contracts/DonationHandler.sol

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import "@openzeppelin/contracts/interfaces/IERC20.sol";
+import "@openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol";
+
+
+
+
+contract DonationHandler is OwnableUpgradeable, ReentrancyGuardUpgradeable {
+
+
+    
+}