Create CONTRIBUTING.md

Author: SurjitSahoo

CONTRIBUTING.md

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+# 🤝 Contributing
+
+We welcome your contributions!
+
+1. **Fork** this repository.
+2. **Clone** your fork and create a new branch:
+   ```bash
+   git checkout -b my-feature
+   ```
+3. **Make your changes** (add docs, fix bugs, improve content).
+4. **Commit** and **push** your branch.
+5. **Open a Pull Request** describing your changes.
+
+For major changes, please open an issue first to discuss your ideas.