Add initial project files for Jellyfin-Plex Library Checker

- Create .editorconfig for consistent coding styles.
- Add .envrc for direnv integration.
- Include .gitignore to exclude environment and build files.
- Implement compare_movies.py and analyze_movies.py for movie library comparison and analysis.
- Implement compare_series.py and analyze_series.py for TV series library comparison and analysis.
- Add configuration example in config.example.txt.
- Create README.md with project overview, setup instructions, and usage examples.
- Add LICENSE file for MIT License.
- Include flake.nix and flake.lock for Nix-based development environment.
- Add USAGE.md for quick start guide and common commands.

.gitignore

@@ -0,0 +1,34 @@
+# Environment and secrets
+.env
+.env.local
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+venv/
+env/
+ENV/
+*.egg-info/
+dist/
+build/
+
+# Reports (generated by scripts)
+*_comparison_report.json
+
+# Direnv
+.direnv/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+