Add desktop GUI application with system tray support

- Created PySide6-based desktop application
- Added system tray integration for Windows and Linux
- Built-in log viewer and configuration wizard
- Easy setup and automatic playlist updates
- Cross-platform compatibility
- Updated README with comprehensive instructions

requirements.txt

@@ -3,4 +3,5 @@ beautifulsoup4
 plexapi
 mutagen
 selenium
-webdriver-manager
+webdriver-manager
+PySide6