implement children post api

- folder 생성 api

@@ -169,14 +169,18 @@ class ItemViewSet(viewsets.ViewSet):
             res['list'] = children_list
             return Response({'data': res}, status=status.HTTP_200_OK)
         if request.method == 'POST':
-            print("post")
-            #
-            # data = JSONParser().parse(request)
-            # serializer = ItemSerializer(data=data)
-            # if serializer.is_valid():
-            #     serializer.save()
-            #     return Response(serializer.data)
-            return Response({'message': 'post is not existed.'}, status=status.HTTP_204_NO_CONTENT)
+            name = request.POST.get('name', ''함)
+            #TODO: user_id 수정해야
+            item = Item(is_folder=True, name=name, file_type="folder", path="", parent=pk, user_id=1, size=0, status=True)
+            item.save()
+            item = Item.objects.filter(item_id = item.item_id)
+            item_data = serializers.serialize("json", item)
+            json_item = json.loads(item_data)
+            res = json_item[0]['fields']
+            res['id']=json_item[0]['pk']
+            res['inside_folder_list'] = []
+            res['inside_file_list'] = []
+            return Response({'data': res}, status=status.HTTP_200_OK)
 
 
 class SharedItemViewSet(viewsets.ModelViewSet):