Add recipe endpoints description for api docs

backend/api/recipes_views.py

@@ -1,9 +1,28 @@
+from django.utils.decorators import method_decorator
+from drf_standardized_errors.openapi_serializers import ErrorResponse404Serializer
+from drf_yasg.utils import swagger_auto_schema
 from rest_framework.viewsets import ReadOnlyModelViewSet
 
 from .recipes_serializers import RecipeSerializer
 from recipes.models import Recipe
 
 
+@method_decorator(
+    name="list",
+    decorator=swagger_auto_schema(
+        operation_summary="List all recipes",
+        operation_description=("Returns a list of all the recipes"),
+        responses={200: RecipeSerializer},
+    ),
+)
+@method_decorator(
+    name="retrieve",
+    decorator=swagger_auto_schema(
+        operation_summary="Get recipe by id",
+        operation_description=("Retrieves a recipe by its id"),
+        responses={200: RecipeSerializer, 404: ErrorResponse404Serializer},
+    ),
+)
 class RecipeViewSet(ReadOnlyModelViewSet):
     queryset = RecipeSerializer.setup_eager_loading(Recipe.objects.all())
     serializer_class = RecipeSerializer