feat: enable basic autosaving

src/main.rs

@@ -96,4 +96,8 @@ impl eframe::App for ToDooDooApp {
             ui.add_sized(ui.available_size(), TextEdit::multiline(&mut self.notes));
         });
     }
+
+    fn save(&mut self, _storage: &mut dyn eframe::Storage) {
+        self.save();
+    }
 }