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.

config.example.txt

@@ -0,0 +1,22 @@
+# Jellyfin-Plex Library Checker Configuration
+# Copy this to .env and fill in your actual values
+
+# Plex Configuration
+PLEX_URL=http://localhost:32400
+PLEX_TOKEN=your_plex_token_here
+
+# Jellyfin Configuration
+JELLYFIN_URL=http://localhost:8096
+JELLYFIN_API_KEY=your_jellyfin_api_key_here
+# NOTE: JELLYFIN_USER_ID must be a UUID, not a username!
+# Get it from: Dashboard → Users → Click your user → Copy ID from URL
+JELLYFIN_USER_ID=a1b2c3d4-5678-90ab-cdef-1234567890ab
+
+# Filesystem Configuration
+MOVIES_PATH=/srv/pool/multimedia/media/Movies
+SERIES_PATH=/srv/pool/multimedia/media/Series
+
+# Optional: Additional series paths (supports up to SERIES_PATH_9)
+# SERIES_PATH_2=/srv/backups/Series
+# SERIES_PATH_3=/mnt/external/TV
+