add SimpleStorage smart contract

simple-storage/.github/workflows/test.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+env:
+  FOUNDRY_PROFILE: ci
+
+jobs:
+  check:
+    strategy:
+      fail-fast: true
+
+    name: Foundry project
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install Foundry
+        uses: foundry-rs/foundry-toolchain@v1
+        with:
+          version: nightly
+
+      - name: Show Forge version
+        run: |
+          forge --version
+
+      - name: Run Forge fmt
+        run: |
+          forge fmt --check
+        id: fmt
+
+      - name: Run Forge build
+        run: |
+          forge build --sizes
+        id: build
+
+      - name: Run Forge tests
+        run: |
+          forge test -vvv
+        id: test

simple-storage/.gitignore

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+# Compiler files
+cache/
+out/
+
+# Ignores development broadcast logs
+!/broadcast
+/broadcast/*/31337/
+/broadcast/**/dry-run/
+
+# Docs
+docs/
+
+# Dotenv file
+.env

simple-storage/README.md

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+## Foundry
+
+**Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.**
+
+Foundry consists of:
+
+-   **Forge**: Ethereum testing framework (like Truffle, Hardhat and DappTools).
+-   **Cast**: Swiss army knife for interacting with EVM smart contracts, sending transactions and getting chain data.
+-   **Anvil**: Local Ethereum node, akin to Ganache, Hardhat Network.
+-   **Chisel**: Fast, utilitarian, and verbose solidity REPL.
+
+## Documentation
+
+https://book.getfoundry.sh/
+
+## Usage
+
+### Build
+
+```shell
+$ forge build
+```
+
+### Test
+
+```shell
+$ forge test
+```
+
+### Format
+
+```shell
+$ forge fmt
+```
+
+### Gas Snapshots
+
+```shell
+$ forge snapshot
+```
+
+### Anvil
+
+```shell
+$ anvil
+```
+
+### Deploy
+
+```shell
+$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>
+```
+
+### Cast
+
+```shell
+$ cast <subcommand>
+```
+
+### Help
+
+```shell
+$ forge --help
+$ anvil --help
+$ cast --help
+```

simple-storage/README_PRVKEY_BEST_PRACTICE.md

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+# 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/foundry.toml

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+[profile.default]
+src = "src"
+out = "out"
+libs = ["lib"]
+
+# See more config options https://github.com/foundry-rs/foundry/blob/master/crates/config/README.md#all-options

simple-storage/script/DeploySimpleStorage.s.sol

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+// 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

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+// 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;
+    }
+}