adds setting screen

src/conversation-list/conversation-list-view.vala

@@ -48,6 +48,16 @@ public class ConversationListView : Adw.Bin
         });
         header_bar.pack_end (refresh_button);
 
+        // Setup application menu
+        var app_menu = new Menu ();
+        app_menu.append ("Refresh", "refresh");
+        app_menu.append ("Settings...", "win.settings");
+        app_menu.append ("Quit", "app.quit");
+        
+        var menu_button = new Gtk.MenuButton ();
+        menu_button.menu_model = app_menu;
+        header_bar.pack_end (menu_button);
+
         // Set up model and bind to list
         conversation_model = new ConversationListModel ();
         conversation_model.items_changed.connect (on_items_changed);