[Qt] Add MainWindow class

src/panda_qt/main_window.cpp

@@ -0,0 +1,10 @@
+#include "panda_qt/main_window.hpp"
+
+MainWindow::MainWindow(QApplication* app, QWidget* parent) : QMainWindow(parent), screen(this) {
+	setWindowTitle("Alber");
+	// Enable drop events for loading ROMs
+	setAcceptDrops(true);
+
+	resize(320, 240);
+	screen.show();
+}