Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Peng Project
+
+Thank you for your interest in contributing! Please follow these guidelines.
+
+## Getting Started
+
+1. **Fork the repository**: Click the "Fork" button at the top right of the repository page.
+2. **Clone your fork**: 
+    ```sh
+    git clone https://github.com/makeecat/Peng.git
+    ```
+3. **Navigate to the project directory**:
+    ```sh
+    cd Peng
+    ```
+4. **Build and run the project**: 
+    ```sh
+    cargo run
+    ```
+
+## How to Contribute
+
+1. **Create a new branch**:
+    ```sh
+    git checkout -b feature/your-feature-name
+    ```
+2. **Make your changes**.
+3. **Test your changes**.
+4. **Commit your changes**:
+    ```sh
+    git commit -m "Brief description of your changes"
+    ```
+5. **Push to your fork**:
+    ```sh
+    git push origin feature/your-feature-name
+    ```
+6. **Create a pull request**: Go to the repository on GitHub and click "New Pull Request".
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the [GPL-3.0 License](LICENSE).