new vault dialog

src/mainwindow.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include "ui_mainwindow.h"
+#include <QMainWindow>
+
+class MainWindow : public QMainWindow {
+  Q_OBJECT
+
+public:
+  explicit MainWindow(QWidget *parent = nullptr);
+
+private:
+  Ui::MainWindow *ui;
+};