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.

USAGE.md

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+# Quick Start Guide
+
+## First Time Setup
+
+1. **Configure your environment:**
+   ```bash
+   cp config.example.txt .env
+   # Edit .env with your actual credentials and paths
+   ```
+
+2. **Enter development environment (Nix users):**
+   ```bash
+   nix develop
+   ```
+
+   **Or install dependencies (pip users):**
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+## Quick Commands
+
+### Movies
+```bash
+# Compare movie libraries
+python compare_movies.py
+
+# Analyze what's missing
+python analyze_movies.py
+```
+
+### TV Series
+```bash
+# Compare series libraries
+python compare_series.py
+
+# Analyze what's missing
+python analyze_series.py
+```
+
+## With Nix Flakes
+```bash
+nix run .#compare-movies
+nix run .#analyze-movies
+nix run .#compare-series
+nix run .#analyze-series
+```
+
+## Output Files
+
+- `movies_comparison_report.json` - Detailed movie data
+- `series_comparison_report.json` - Detailed series data
+
+## First Steps After Running
+
+1. Check for `.plexignore` files (the scripts will warn you)
+2. Review the analysis output for patterns
+3. Force a Plex library scan if needed
+4. Check Plex logs for scanner errors
+
+## Common Fixes
+
+- **Movies in `.plexignore`** → Remove entries, rescan Plex
+- **Empty series directories** → Plex correctly ignores these
+- **Old codecs (mpeg4, mpeg2)** → Re-encode or replace files
+- **Low resolution** → Replace with HD versions
+- **Title mismatches** → These are actually in Plex, just different names