remove Counter contract and add basic Raffle contract

lottery/script/Counter.s.sol

@@ -1,19 +0,0 @@
-// SPDX-License-Identifier: UNLICENSED
-pragma solidity ^0.8.13;
-
-import {Script, console} from "forge-std/Script.sol";
-import {Counter} from "../src/Counter.sol";
-
-contract CounterScript is Script {
-    Counter public counter;
-
-    function setUp() public {}
-
-    function run() public {
-        vm.startBroadcast();
-
-        counter = new Counter();
-
-        vm.stopBroadcast();
-    }
-}

lottery/src/Counter.sol

@@ -1,14 +0,0 @@
-// SPDX-License-Identifier: UNLICENSED
-pragma solidity ^0.8.13;
-
-contract Counter {
-    uint256 public number;
-
-    function setNumber(uint256 newNumber) public {
-        number = newNumber;
-    }
-
-    function increment() public {
-        number++;
-    }
-}

lottery/src/Raffle.sol

@@ -0,0 +1,48 @@
+// Layout of Contract:
+// version
+// imports
+// errors
+// interfaces, libraries, contracts
+// Type declarations
+// State variables
+// Events
+// Modifiers
+// Functions
+
+// Layout of Functions:
+// constructor
+// receive function (if exists)
+// fallback function (if exists)
+// external
+// public
+// internal
+// private
+// view & pure functions
+
+// SPDX-License-Identifier: SEE LICENSE IN LICENSE
+pragma solidity 0.8.19;
+
+/**
+ * @title  A sample Raffle contract
+ * @author hirugohan
+ * @notice This contract is for creating a sample raffle
+ * @dev    Implements Chainlink VRFv2.5
+ */
+contract Raffle {
+    uint256 private immutable i_entranceFee;
+	
+    constructor (uint256 entranceFee) {
+        i_entranceFee = entranceFee;
+    }
+	
+    function enterRaffle() public payable {
+        require(msg.value >= i_entranceFee, "Not enough ETH sent!");
+    }
+	
+    function pickWinner() public {}
+	
+    /** Getter Functions */
+    function getEntranceFee() external view returns (uint256) {
+        return i_entranceFee;
+    }
+}

lottery/test/Counter.t.sol

@@ -1,24 +0,0 @@
-// SPDX-License-Identifier: UNLICENSED
-pragma solidity ^0.8.13;
-
-import {Test, console} from "forge-std/Test.sol";
-import {Counter} from "../src/Counter.sol";
-
-contract CounterTest is Test {
-    Counter public counter;
-
-    function setUp() public {
-        counter = new Counter();
-        counter.setNumber(0);
-    }
-
-    function test_Increment() public {
-        counter.increment();
-        assertEq(counter.number(), 1);
-    }
-
-    function testFuzz_SetNumber(uint256 x) public {
-        counter.setNumber(x);
-        assertEq(counter.number(), x);
-    }
-}