Update README.md with comprehensive project documentation

[Copilot]

The README.md file was incomplete (contained only "1.") and needed to be updated to properly document the GameAI API project.

What was added:

📖 Complete Project Documentation

• Project Overview: Clear description of the FastAPI-based sports analytics and prediction API
• Feature Documentation: Detailed breakdown of MLB and NFL prediction capabilities
• Technology Stack: Comprehensive list of frameworks, ML libraries, and tools used

🚀 Getting Started Guide

• Installation Instructions: Step-by-step setup process including virtual environment creation
• Environment Configuration: Documentation for required API keys and configuration variables
• Running Instructions: Both development and production deployment commands

📚 API Reference

• Endpoint Documentation: Complete list of all MLB and NFL endpoints with descriptions
• Usage Examples: Practical curl examples for testing key endpoints
• Request/Response Formats: Clear examples of API interactions

🏗️ Technical Information

• Project Structure: Detailed directory layout explanation
• Machine Learning Models: Description of algorithms used (XGBoost, Random Forest, etc.)
• Data Sources: Information about GoalServe API integration and data collection
• Development Guide: Instructions for adding new features and model training

🔧 Developer Resources

• Testing Instructions: How to run the test suite
• Contributing Guidelines: Standard GitHub contribution workflow
• Support Information: Where to find help and documentation

The README now provides a professional, comprehensive guide that allows developers to understand, install, run, and contribute to the GameAI API project effectively.

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