Title: Add contribution guidance to the README
Add a Contributing section explaining how to propose a change and open a pull request.
Acceptance criteria:
- Follow the repository's existing setup and contribution instructions.
- Do not invent commands the project does not support.
- Keep the change limited to documentation.
- Open a pull request for human review.
Title: Add contribution guidance to the README
Add a Contributing section explaining how to propose a change and open a pull request.
Acceptance criteria: