[Qt] Add MainWindow class

include/panda_qt/main_window.hpp

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <QApplication>
+#include <QtWidgets>
+
+#include "panda_qt/screen.hpp"
+
+class MainWindow : public QMainWindow {
+	Q_OBJECT
+
+  private:
+	ScreenWidget screen;
+
+  public:
+	MainWindow(QApplication* app, QWidget* parent = nullptr);
+};