docs: add contributing desc

Author: qin-ctx

CONTRIBUTING.md

@@ -36,25 +36,45 @@ Found a bug or have a feature request? [Create an issue](https://github.com/volc
 - Steps to reproduce (for bugs)
 - Your environment (OS, Python version, MineContext version)
 
+### Branch Naming Convention
+
+Use descriptive branch names with appropriate prefixes:
+
+| Prefix | Purpose | Example |
+|--------|---------|---------|
+| `feature/` or `feat/` | New features | `feature/add-notion-integration` |
+| `fix/` | Bug fixes | `fix/screenshot-capture-error` |
+| `hotfix/` | Critical production fixes | `hotfix/memory-leak` |
+| `docs/` | Documentation only | `docs/update-api-guide` |
+| `refactor/` | Code refactoring | `refactor/simplify-storage-layer` |
+| `test/` | Adding or updating tests | `test/add-processor-tests` |
+| `chore/` | Maintenance tasks | `chore/update-dependencies` |
+
 ### Submitting Code
 
 1. **Create a branch**
 
+   Follow the branch naming convention above:
    ```bash
    git checkout -b feature/your-feature-name
+   # or
+   git checkout -b fix/your-bug-fix
    ```
+
 2. **Make your changes**
 
    - Follow [PEP 8](https://pep8.org/) style guidelines
    - Add tests for new features
    - Update documentation if needed
+
 3. **Commit with clear messages**
 
    ```bash
    git commit -m "feat: add your feature description"
    # or
    git commit -m "fix: fix your bug description"
    ```
+
 4. **Push and create a Pull Request**
 
    ```bash