feat: add CONTRIBUTING.md

Author: ChharithOeun

CONTRIBUTING.md

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+# Contributing
+
+Contributions are welcome. This toolkit is a living index of AMD Windows AI resources.
+
+## What We Accept
+
+- New repos added to the ecosystem table
+- Fixes to broken links or outdated versions
+- Better GPU detection logic for `doctor.py` or `check_gpu.py`
+- New scripts useful across the ecosystem (benchmarking, model management, etc.)
+- Documentation improvements
+- Verified test results on new AMD GPU models
+
+## How to Contribute
+
+1. Fork the repo
+2. Create a branch: `git checkout -b feat/your-feature`
+3. Make your changes
+4. Test on an AMD GPU on Windows if possible
+5. Submit a pull request with a clear description
+
+## Adding a Repo to the Ecosystem Table
+
+If you have a repo that helps AMD GPU users on Windows:
+
+1. Open an issue using the Feature Request template
+2. Include: repo URL, what it does, which backend it uses (DirectML / Vulkan)
+3. We'll verify it works before adding it to the table
+
+## Code Style
+
+- Python 3.10+ compatible
+- No external dependencies for diagnostic scripts (`doctor.py`, `check_gpu.py`, `check_gpu.py`)
+- Standard library only for the core toolkit; use `try_import` pattern for optional packages
+- Docstring at the top of each script with usage example
+
+## Reporting Issues
+
+Use the [Bug Report template](.github/ISSUE_TEMPLATE/bug_report.md) and include:
+- GPU model and VRAM
+- AMD driver version
+- Windows version
+- Python version
+- Full error output
+
+The output of `python scripts\doctor.py` covers most of these automatically.
+
+## License
+
+By contributing you agree your code will be released under the [MIT License](LICENSE).