Add Foundry Counter tutorial for Monad testnet

tutorials/foundry-counter/.env.example

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+PRIVATE_KEY=your_wallet_private_key
+RPC_URL=https://rpc.testnet.monad.xyz/
+

tutorials/foundry-counter/README.md

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+Here is the **`README.md`** content exactly as provided earlier, with **no rephrasing**:
+
+---
+
+````markdown
+# 🧪 Deploying a Minimal Counter Contract on Monad Testnet (Using Foundry)
+
+This tutorial walks you through deploying a simple `Counter.sol` contract to the Monad Testnet using Foundry.
+
+---
+
+## 🛠 Prerequisites
+
+- [Foundry](https://book.getfoundry.sh/getting-started/installation)
+- A funded wallet on Monad Testnet
+- [RPC URL](https://rpc.testnet.monad.xyz/)
+- A `.env` file with your wallet private key
+
+---
+
+## 🧾 Setup
+
+Clone this repo or copy this folder structure:
+
+```bash
+git clone https://github.com/monad-developers/foundry-monad
+cd foundry-monad
+````
+
+Install dependencies:
+
+```bash
+forge install
+```
+
+Create a `.env` file:
+
+```bash
+cp .env.example .env
+```
+
+Edit `.env` with your private key and Monad RPC:
+
+```env
+PRIVATE_KEY=your_private_key
+RPC_URL=https://rpc.testnet.monad.xyz/
+```
+
+---
+
+## 🧱 Contract: `Counter.sol`
+
+```solidity
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+contract Counter {
+    uint256 public count;
+
+    function increment() public {
+        count++;
+    }
+}
+```
+
+---
+
+## 🚀 Deployment Script
+
+Create `script/Deploy.s.sol`:
+
+```solidity
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import "forge-std/Script.sol";
+import "../src/Counter.sol";
+
+contract Deploy is Script {
+    function run() external {
+        vm.startBroadcast();
+        new Counter();
+        vm.stopBroadcast();
+    }
+}
+```
+
+---
+
+## ▶️ Deploying to Monad
+
+```bash
+forge script script/Deploy.s.sol --rpc-url $RPC_URL --private-key $PRIVATE_KEY --broadcast --verify
+```
+
+---
+
+## ✅ Verifying Deployment
+
+If successful, you’ll see the deployed contract address in the terminal.
+
+You can interact with the contract using Foundry or a Monad explorer.
+
+---
+
+## 🧠 Why This Matters
+
+* This is the **simplest Monad-compatible dApp** using Foundry.
+* Fully testnet-compatible.
+* Sets the foundation for more complex tutorials.
+
+---
+
+## 🙌 Credits
+
+Feel free to fork, improve, or reference this for your own dApps!
+

tutorials/foundry-counter/script/Deploy.s.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import "forge-std/Script.sol";
+import "../src/Counter.sol";
+
+contract Deploy is Script {
+    function run() external {
+        vm.startBroadcast();
+        new Counter();
+        vm.stopBroadcast();
+    }
+}
+

tutorials/foundry-counter/src/Counter.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+contract Counter {
+    uint256 public count;
+
+    function increment() public {
+        count++;
+    }
+}
+