updates

src/main.cpp

@@ -0,0 +1,8 @@
+#include "window.hpp"
+#include <gtkmm/application.h>
+
+int main(int argc, char* argv[]) {
+    auto app = Gtk::Application::create("org.gtkmm.minesweeper");
+    
+    return app->make_window_and_run<MainWindow>(argc, argv);
+}