add docstring for establishment subtype

apps/establishment/views/back.py

@@ -567,7 +567,20 @@ class EstablishmentTypeRUDView(generics.RetrieveUpdateDestroyAPIView):
 
 
 class EstablishmentSubtypeListCreateView(generics.ListCreateAPIView):
-    """Establishment subtype list/create view."""
+    """
+    Establishment subtype list/create view.
+
+    **GET**
+    ```
+    Implement getting establishment subtype.
+    ```
+
+    **POST**
+    ```
+    Implement create establishment subtype.
+    ```
+
+    """
     serializer_class = serializers.EstablishmentSubTypeBaseSerializer
     queryset = models.EstablishmentSubType.objects.select_related('default_image')
     pagination_class = None