Add standard LICENSE and CONTRIBUTING documents

[Copilot]

This repo was missing dedicated LICENSE and CONTRIBUTING.md files, leaving community-standard metadata embedded only as brief README notes. This change promotes those sections into first-class repository documents and keeps the README as the entry point.

• Community standards

  • Add a top-level LICENSE file with the repository’s MIT license text
  • Add a top-level CONTRIBUTING.md with contribution scope, PR expectations, and existing repo checks

• README cleanup

  • Replace the inline contributing/license blurbs with links to the new canonical documents
  • Keep contribution and licensing guidance discoverable without duplicating content in multiple places

• Result

  • GitHub and other tooling can now detect repository license and contribution guidance directly from standard file locations

## 🤝 Contributing

...review the [contributing guide](./CONTRIBUTING.md) and open a pull request.

## 📄 License

This project is available under the [MIT License](./LICENSE).