Move DolphinQt2 to DolphinQt

Source/Core/DolphinQt/AboutDialog.h

@@ -0,0 +1,14 @@
+// Copyright 2016 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QDialog>
+
+class AboutDialog final : public QDialog
+{
+  Q_OBJECT
+public:
+  explicit AboutDialog(QWidget* parent = nullptr);
+};