Context

Open Permit is now accepting community contributions. New contributors need a clear guide to get started.

Task

Create `CONTRIBUTING.md` covering:

1. Local dev setup — clone, install deps, env vars, run backend + frontend
2. Architecture overview — what each major file does (server.js, personaConfig.js, permitIngestion.js, etc.)
3. How to add a new persona — just add an entry to personaConfig.js
4. How to add a new permit source — add to permit-sources.json + optional transformer
5. How to add a new legal framework — add to getCountryLegalFramework()
6. PR guidelines — branch naming, commit messages, testing
7. Issue labels — what each label means

Reference

• README.md has some info but is outdated
• Backend structure is in `backend/`
• Frontend is Next.js in `frontend/`