docs: add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to envui
+
+Thank you for your interest in contributing to envui. All contributions are welcome.
+
+## How to Contribute
+
+For significant changes, please open an issue first to discuss your proposed changes. This helps ensure alignment with project goals and prevents duplicate efforts.
+
+## Development Process
+
+### Getting Started
+
+1. Fork the repository
+2. Clone your fork: `git clone https://github.com/your-username/envui.git`
+3. Create a feature branch from `develop`: `git checkout -b feature/your-feature develop`
+4. Make your changes
+5. Push to your fork: `git push origin feature/your-feature`
+6. Open a Pull Request against the `develop` branch
+
+### Commit Messages
+
+Follow the [Conventional Commits](https://www.conventionalcommits.org/) specification:
+
+### Pull Requests
+
+Keep pull requests small and focused. Each PR should represent a single logical change. Split large changes into multiple PRs when possible.
+
+## Development Setup
+
+### Prerequisites
+
+- Node.js 18 or higher
+- pnpm package manager
+
+### Installation
+
+```bash
+pnpm install
+```
+
+### Running Tests
+
+```bash
+pnpm test
+```
+
+### Building
+
+```bash
+pnpm build
+```
+
+### Linting and Formatting
+
+```bash
+pnpm lint
+pnpm lint:fix
+pnpm format
+pnpm typecheck
+```
+
+## Questions and Support
+
+If you have questions or need clarification, please open an issue. We aim to respond promptly to all inquiries.
+
+## License
+
+By contributing to envui, you agree that your contributions will be licensed under the MIT License.