Add setup and installation instructions to README #31
Description
Problem
The GreenCode README lacks basic setup and installation instructions, making it difficult for new contributors to get started with the project.
Proposed Improvement
Add comprehensive setup instructions including:
- Prerequisites (Java, Maven, PostgreSQL, Node.js, Docker)
- Docker setup instructions (recommended method)
- Local development setup without Docker
- Production build instructions
Expected Benefit
New contributors will be able to quickly set up the development environment and start contributing to the project without needing to dig through source code or ask for help.