Add export menu item to DeliveryAdminWindow

Elwig/Windows/DeliveryAdminWindow.xaml

@@ -64,6 +64,10 @@
                 <MenuItem x:Name="Menu_Print_PrintDeliveryNote" Header="Lieferschein drucken" IsEnabled="False"
                           Click="Menu_Print_PrintDeliveryNote_Click"/>
             </MenuItem>
+            <MenuItem Header="Exportieren">
+                <MenuItem x:Name="Menu_Export_Bki" Header="Traubentransportscheinliste (BKI)"
+                          Click="Menu_Export_Bki_Click"/>
+            </MenuItem>
             <MenuItem Header="Werkzeuge">
                 <MenuItem Header="Alle Lieferscheine überprüfen"/>
             </MenuItem>

Elwig/Windows/DeliveryAdminWindow.xaml.cs

@@ -114,6 +114,10 @@ namespace Elwig.Windows {
             await doc.Print();
         }
 
+        private void Menu_Export_Bki_Click(object sender, RoutedEventArgs evt) {
+
+        }
+
         private void OnSecondPassed(object? sender, EventArgs? evt) {
             if (IsReceipt && IsCreating) {
                 var now = DateTime.Now;