docs: public ContainerView createContainerView(SoftwareSystem softwareSystem, String key, String description) {
          assertThatTheSoftwareSystemIsNotNull(softwareSystem);
          assertThatTheViewKeyIsSpecifiedAndUnique(key);
  
          ContainerView view = new ContainerView(softwareSystem, key, description);
          view.setViewSet(this);
          containerViews.add(view);
          return view;
      }