Added FundMe & PriceConverter

contracts/PriceConverter.sol

@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.8;
+
+import "@chainlink/contracts/src/v0.8/shared/interfaces/AggregatorV3Interface.sol";
+
+// Why is this a library and not abstract?
+// Why not an interface?
+library PriceConverter {
+    // We could make this public, but then we'd have to deploy it
+    function getPrice() internal view returns (uint256) {
+        // Sepolia ETH / USD Address
+        // https://docs.chain.link/data-feeds/price-feeds/addresses#Sepolia%20Testnet
+        AggregatorV3Interface priceFeed = AggregatorV3Interface(
+            0x694AA1769357215DE4FAC081bf1f309aDC325306
+        );
+        (, int256 answer, , , ) = priceFeed.latestRoundData();
+        // ETH/USD rate in 18 digit
+        return uint256(answer * 10000000000);
+        // or (Both will do the same thing)
+        // return uint256(answer * 1e10); // 1* 10 ** 10 == 10000000000
+    }
+
+    // 1000000000
+    function getConversionRate(
+        uint256 ethAmount
+    ) internal view returns (uint256) {
+        uint256 ethPrice = getPrice();
+        uint256 ethAmountInUsd = (ethPrice * ethAmount) / 1000000000000000000;
+        // or (Both will do the same thing)
+        // uint256 ethAmountInUsd = (ethPrice * ethAmount) / 1e18; // 1 * 10 ** 18 == 1000000000000000000
+        // the actual ETH/USD conversion rate, after adjusting the extra 0s.
+        return ethAmountInUsd;
+    }
+}