Create CONTRIBUTING_QUICKSTART.md for new developers

[coderabbitai]

Description

Create a quickstart guide to help new contributors set up the development environment in under 10 minutes.

Context

While CONTRIBUTING.md exists, a focused quickstart guide would help onboard new developers faster with step-by-step instructions.

Tasks

• Create CONTRIBUTING_QUICKSTART.md in the project root
• Include sections:
  • Prerequisites - Required tools (Python, Node, Docker)
  • Quick Setup (5 steps max)
  • Running Locally - One-command startup
  • Making Your First Change - Simple example
  • Running Tests - Quick test commands
  • Troubleshooting - Common issues
  • Next Steps - Link to full CONTRIBUTING.md

Acceptance Criteria

• Guide is concise (under 200 lines)
• Steps are tested and work on clean environment
• Includes copy-paste commands
• Has a "Time to first run: <10 minutes" section
• Links to detailed docs for more info

Resources

• Existing guide: CONTRIBUTING.md
• Project setup: docker-compose.yml, requirements.txt

Estimated Time

60-90 minutes