Add initial work on Qt frontend

src/duckstation-qt/consolesettingswidget.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <QtWidgets/QWidget>
+
+#include "ui_consolesettingswidget.h"
+
+class ConsoleSettingsWidget : public QWidget
+{
+  Q_OBJECT
+
+public:
+  explicit ConsoleSettingsWidget(QWidget* parent = nullptr);
+  ~ConsoleSettingsWidget();
+
+private:
+  Ui::ConsoleSettingsWidget m_ui;
+};