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.

.editorconfig

@@ -0,0 +1,23 @@
+# EditorConfig helps maintain consistent coding styles
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.py]
+indent_style = space
+indent_size = 4
+
+[*.{yml,yaml,json}]
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.nix]
+indent_style = space
+indent_size = 2