Add initial implementation of Stats Tracker with environment configuration and player stats tracking

- Create .env.example for environment variable setup
- Add .gitignore to exclude sensitive files and cache
- Implement README.md with setup instructions and usage details
- Develop main.py for fetching and posting player stats to Discord
- Create overlay.py for displaying stats in a GUI overlay
- Add players.json to define players to track
- Specify dependencies in requirements.txt

.gitignore

@@ -0,0 +1,7 @@
+.env
+__pycache__/
+*.pyc
+.venv/
+venv/
+message_id.txt
+stats_cache.json