checkpoint: manage parsing, persistence, mainwindow structure

mainwindow.h

@@ -4,15 +4,30 @@
 #include <QObject>
 #include <QMainWindow>
 
+class Service;
+class SessionsListModel;
+
 QT_BEGIN_NAMESPACE
 QT_END_NAMESPACE
 
+namespace Ui {
+class MainWindow;
+}
+
 class MainWindow : public QMainWindow {
   Q_OBJECT
 
 public:
   MainWindow(QWidget *parent = nullptr);
   ~MainWindow();
+
+  private slots:
+  void on_selectVaultButton_clicked();
+
+  private:
+  Ui::MainWindow *ui;
+  Service *m_service;
+  SessionsListModel *m_listModel;
 };
 
 #endif // MAINWINDOW_H