Add README with setup instructions

[RossCabrera]

Overview

Create a clear and complete README.md to help developers understand, set up, and contribute to the project.

Scope

The README should include:

• Project overview (description + tech stack)
• Quick start (minimal setup steps)
• Backend setup (requirements, install, env vars, run)
• Frontend setup (requirements, install, env vars, run)
• Project structure (high-level explanation)
• API documentation links (/api/docs/, /api/redoc/)
• Running tests (backend + frontend)
• Deployment notes (optional)
• Contributing guidelines
• Troubleshooting section
• License & credits

Acceptance Criteria

• README is clear and easy to follow
• Setup instructions work
• Includes code examples where needed
• API docs are linked
• Proper Markdown formatting

Related Issues

• Depends on: Document all API endpoints #27 and All the Phases (1-4)