- Add models: Note, SyncStatus - Add storage: NotesStorage for local file system - Add sync: WebDavSyncService, SyncWorker, WifiSyncReceiver - Add UI: MainActivity, NoteEditorActivity, SettingsActivity - Add adapters: NotesAdapter - Add utils: Constants, DeviceIdGenerator, Extensions, NotificationHelper - Add layouts: activity_main, activity_editor, activity_settings, item_note - Add menus and strings