Feat: Add default selection of first entry

CityDoctorParent/Extensions/CityDoctorGUI/src/main/java/de/hft/stuttgart/citydoctor2/gui/ZipEntryPicker.java

@@ -130,7 +130,9 @@ public class ZipEntryPicker {
         for (CityGmlZipEntry entry : archive.getEntries()) {
             entryList.getItems().add(new ZipEntryNode(entry));
         }
-
+        entryList.getSelectionModel().clearSelection();
+        entryList.getSelectionModel().select(0);
+        showMetadata(entryList.getSelectionModel().getSelectedItem().getEntry());
     }
 
     private void showMetadata(CityGmlZipEntry entry) {