Setup Docker and docker-compose

[Hamzaa6296]

Description:

What needs to be done

• Create Dockerfile for backend
• Create Dockerfile for frontend
• Create docker-compose.yml for local dev
• Add MongoDB service in docker-compose
• Add .env.example files for both apps
• Write Docker setup guide in README

Acceptance Criteria

• docker-compose up starts all services
• Backend accessible at localhost:3001
• Frontend accessible at localhost:3000
• MongoDB running in container