Improve Docker Compose setup for one-command local deployment

[kmuwanga83]

📌 Problem

Docker setup exists but is not fully documented or optimized for quick onboarding.

🎯 Objective

Enable one-command local deployment using Docker Compose.

✅ Tasks

• Review and improve docker-compose.yml
• Ensure services:
  • backend
  • database
• Add environment variable support
• Document usage in README

🧪 Acceptance Criteria

• docker compose up runs the application successfully
• Required ports and services are documented
• Setup works on a fresh machine

💡 Suggested Labels

devops, backend, documentation