add notifications

include/widgets/notification.hpp

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <giomm.h>
+#include <gtkmm.h>
+#include <memory>
+#include "gdkmm/monitor.h"
+class NotificationWidget {
+    public:
+        NotificationWidget(std::shared_ptr<Gdk::Monitor> monitor, const Glib::ustring &title, const Glib::ustring &message);
+};