Add CONTRIBUTING.md with setup, workflow, and PR guidelines #15
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What & Why
This PR adds a CONTRIBUTING.md file to the CMS repository to help new contributors get started quickly and submit high-quality pull requests. The guide documents environment setup, subproject-specific quickstarts, data handling rules, PR workflow, and issue reporting standards.
What’s included
Quick start instructions for contributing
Subproject-specific setup notes (MAEs, GNNs, E2E)
Environment and dependency guidelines
Data and large file handling rules
PR checklist and suggested PR template content
Bug reporting guidelines
Code style, testing, and CI/smoke test recommendations
Maintainer contact and communication norms
How to test
Review CONTRIBUTING.md for clarity and completeness
Follow the instructions for any subproject to ensure steps are reproducible
Notes
No code changes included
No dependencies added
Intended to improve onboarding, consistency, and review efficiency