Update CONTRIBUTING.md

Author: Namitjain07

CONTRIBUTING.md

@@ -3,15 +3,49 @@
 Thank you for your interest in contributing to **PrivacyFirst**!
 
 ## Before You Start
-- PrivacyFirst is currently a **private project**.
-- Contributions are reviewed and accepted manually by the repository owner.
+
+* PrivacyFirst is currently a **private project**.
+* All contributions are reviewed and accepted manually by the repository owner.
 
 ## Ways to Contribute
-- Reporting a bug
-- Suggesting a feature
-- Improving documentation
-- Submitting pull requests (PRs)
+
+* Reporting bugs
+* Suggesting new features
+* Improving documentation
+* Submitting pull requests (PRs)
 
 ## Pull Requests
-1. Fork the repository
-2. Create a feature branch:
+
+1. **Fork** the repository.
+2. **Create a feature branch:**
+
+   ```bash
+   git checkout -b feature/my-feature
+   ```
+3. **Commit** using clear, conventional messages such as:
+
+   ```
+   feat: add biometric authentication improvements
+   fix: resolve crash in WebView SSL handler
+   ```
+4. **Submit a PR** including:
+
+   * A clear description of the changes
+   * A linked issue (if applicable)
+
+## Code Style
+
+* Follow standard **Kotlin coding conventions**
+* Use **Jetpack Compose** and **MVVM architecture**
+* Document all **security-related changes** thoroughly
+
+## Testing
+
+* Test on real devices whenever possible
+* Ensure the API server is functioning before submitting backend-related changes
+
+## Questions?
+
+Open an issue or contact the maintainer.
+
+---