Add note-taking application with system tray support

• Implemented a Tkinter-based GUI for taking and displaying notes.
• Integrated JSON file handling for saving and loading notes.
• Added functionality to show notes in a tree view.
• Included keyboard shortcut (Ctrl + Alt + N) to open the note-taking app.
• Set up a system tray icon using pystray for easy access to the application.
• Added an exit option in the system tray menu to close the application.
• Included an image asset (notes.png) for the system tray icon.