add docstring for ContentType

apps/main/views/back.py

@@ -200,7 +200,12 @@ class AwardTypesListView(generics.ListAPIView):
 
 
 class ContentTypeView(generics.ListAPIView):
-    """ContentType list view"""
+    """
+    ContentType list view
+
+    ```
+    Implement getting list of ContentType
+    """
     queryset = ContentType.objects.all()
     serializer_class = serializers.ContentTypeBackSerializer
     permission_classes = get_permission_classes()