Initial commit: Multiplayer Snake game with server discovery

Implemented a complete network multiplayer Snake game with the following features:

Core Game:
- Client-server architecture using asyncio for networking
- Pygame-based rendering at 60 FPS
- Server-authoritative game state with 10 TPS
- Collision detection (walls, self, other players)
- Food spawning and score tracking
- Support for multiple players with color-coded snakes

Server Discovery:
- UDP multicast-based automatic server discovery (239.255.0.1:9999)
- Server beacon broadcasts presence every 2 seconds
- Client discovery with 3-second timeout
- Server selection UI for multiple servers
- Auto-connect for single server
- Graceful fallback to manual connection

Project Structure:
- src/shared/ - Protocol, models, constants, discovery utilities
- src/server/ - Game server, game logic, server beacon
- src/client/ - Game client, renderer, discovery, server selector
- tests/ - Unit tests for game logic, models, and discovery

Command-line interface with argparse for both server and client.
Comprehensive documentation in README.md and CLAUDE.md.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,41 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+venv/
+env/
+ENV/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/
+.tox/
+
+# IDEs
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db