docs: add contributing guidelines and project roadmap

- Create CONTRIBUTING.md with comprehensive guidelines for community contributions
- Develop ROADMAP.md outlining near-term, mid-term, and long-term project goals
- Provide clear instructions for code style, testing, and community engagement
- Define project vision and future enhancement strategies

docs/CONTRIBUTING.md

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+# Contributing to Home Assistant MCP
+
+We welcome contributions from the community! Your help and feedback are essential to improving the MCP Server. Please review the following guidelines before contributing.
+
+## How to Contribute
+
+1. **Fork the Repository**: Create your personal fork of the project on GitHub.
+2. **Create a Feature Branch**: Use clear branch names, e.g., `feature/your-feature` or `bugfix/short-description`.
+3. **Make Changes**: Develop your feature or fix bugs. Ensure your code follows the project's coding conventions.
+4. **Write Tests**: Include tests for new features or bug fixes. We aim for high code coverage.
+5. **Submit a Pull Request (PR)**: Once your changes are complete, submit a PR. Our team will review your request and provide feedback.
+6. **Address Feedback**: Make any necessary revisions based on code review feedback.
+
+## Code Style Guidelines
+
+- Follow the project's established coding style.
+- Use Bun tooling for linting and formatting:
+  - `bun run lint` for linting
+  - `bun run format` for formatting
+
+## Documentation
+
+- Update relevant documentation alongside your code changes.
+- Ensure that tests pass and coverage remains high.
+
+## Reporting Issues
+
+- Use the GitHub Issues page to report bugs, request new features, or ask questions.
+- Provide clear descriptions, replication steps, and any error logs.
+
+## Community
+
+- Join our real-time discussions on our chat platforms (Discord, Slack, etc.).
+- Engage with other contributors to exchange ideas and solutions.
+
+Thank you for helping improve the Home Assistant MCP project!