docs: add CONTRIBUTING.md and improve README with installation guide

CONTRIBUTING.md

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+# Contributing to CCometixLine
+
+Thank you for contributing to CCometixLine!
+
+## Prerequisites
+
+- **Rust 1.70+** - Install via [rustup](https://rustup.rs/)
+- Git for version control
+
+## Development Setup
+
+1. **Clone the repository**
+   ```bash
+   git clone https://github.com/Haleclipse/CCometixLine.git
+   cd CCometixLine
+   ```
+
+2. **Build the project**
+   ```bash
+   cargo build --release
+   ```
+
+3. **Run tests**
+   ```bash
+   cargo test
+   cargo clippy  # Linting
+   cargo fmt     # Formatting
+   ```
+
+4. **Run in development mode**
+   ```bash
+   cargo run
+   ```
+
+## Project Structure
+
+```
+src/
+├── main.rs           # Application entry point
+└── lib.rs            # Library code (if applicable)
+
+# Configuration
+cliff.toml            # Conventional changelog configuration
+lefthook.yml          # Git hooks configuration
+```
+
+## Code Style
+
+- Run `cargo fmt` before committing
+- Run `cargo clippy` to catch common mistakes
+- Write idiomatic Rust with clear naming conventions
+- Add doc comments (`///`) for public functions
+
+## Conventional Commits
+
+This project uses [Conventional Commits](https://www.conventionalcommits.org/):
+
+- `feat:` - New feature
+- `fix:` - Bug fix
+- `docs:` - Documentation changes
+- `refactor:` - Code refactoring
+- `test:` - Adding or updating tests
+- `chore:` - Maintenance tasks
+
+## Testing
+
+```bash
+# Run all tests
+cargo test --all
+
+# Run with output
+cargo test -- --nocapture
+
+# Run specific test
+cargo test test_name
+```
+
+## Pull Request Process
+
+1. Fork the repository
+2. Create a feature branch (`feat/your-feature`)
+3. Make your changes
+4. Ensure tests pass and clippy is clean
+5. Commit using conventional commit format
+6. Push and create a PR
+
+## Reporting Issues
+
+Include in your issue report:
+- Rust version (`rustc --version`)
+- Operating system and version
+- Steps to reproduce the issue
+- Expected behavior
+
+## License
+
+By contributing, you agree your contributions will be licensed under the project license.