add SimpleStorage smart contract

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "hello_foundry/lib/forge-std"]
 	path = hello_foundry/lib/forge-std
 	url = https://github.com/foundry-rs/forge-std
+[submodule "simple-storage/lib/forge-std"]
+	path = simple-storage/lib/forge-std
+	url = https://github.com/foundry-rs/forge-std

hello_foundry/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();
-    }
-}

hello_foundry/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++;
-    }
-}

hello_foundry/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);
-    }
-}

simple-storage/README_PRVKEY_BEST_PRACTICE.md

@@ -0,0 +1,21 @@
+# Private Key Best Practice
+
+Utilize `cast wallet`
+
+```bash
+cast wallet import nameOfWalletOrAddress --interactive
+```
+
+Then run everything with private key from account
+
+Previously:
+
+```bash
+forge script script/DeploySimpleStorage.s.sol --rpc-url $RPC_URL --broadcast --private-key $PRIVATE_KEY
+```
+
+Now:
+
+```bash
+forge script script/DeploySimpleStorage.s.sol --rpc-url http://127.0.0.1:8545 --broadcast --account nameOfAccountGoesHere --sender 0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266
+```

simple-storage/script/DeploySimpleStorage.s.sol

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.19;
+
+import {Script} from "forge-std/Script.sol";
+import {SimpleStorage} from "../src/SimpleStorage.sol";
+
+contract DeploySimpleStorage is Script {
+	function run() external returns (SimpleStorage) {
+		vm.startBroadcast();
+		SimpleStorage simpleStorage = new SimpleStorage();
+		vm.stopBroadcast();
+		return simpleStorage;
+	}
+}

simple-storage/src/SimpleStorage.sol

@@ -0,0 +1,33 @@
+// I'm a comment!
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.19;
+
+// pragma solidity ^0.8.0;
+// pragma solidity >=0.8.0 <0.9.0;
+
+contract SimpleStorage {
+    uint256 myFavoriteNumber;
+
+    struct Person {
+        uint256 favoriteNumber;
+        string name;
+    }
+    // uint256[] public anArray;
+    Person[] public listOfPeople;
+
+    mapping(string => uint256) public nameToFavoriteNumber;
+
+    function store(uint256 _favoriteNumber) public {
+        myFavoriteNumber = _favoriteNumber;
+    }
+
+    function retrieve() public view returns (uint256) {
+        return myFavoriteNumber;
+    }
+
+    function addPerson(string memory _name, uint256 _favoriteNumber) public {
+        listOfPeople.push(Person(_favoriteNumber, _name));
+        nameToFavoriteNumber[_name] = _favoriteNumber;
+    }
+}