UI itself is usable

src/frontend/MainWindow.hpp

@@ -0,0 +1,24 @@
+#pragma once
+#include <QMainWindow>
+#include "ui_mainwindow.h"
+
+class MainWindowController : public QMainWindow
+{
+  Q_OBJECT
+
+public:
+  MainWindowController() noexcept;
+
+private:
+  void ConnectSignalsToSlots() noexcept;
+
+  Ui::MainWindow view;
+  bool textPauseToggle = false;
+
+signals:
+  void OpenROM(const QString& rom_file);
+  void Exit();
+  void Reset();
+  void Stop();
+  void Pause();
+};