add get item api

@@ -57,8 +57,12 @@ class ItemViewSet(viewsets.ViewSet):
     # url: items/11/
     # 마지막 slash도 써주어야함
     def get(self, request, pk):
-        print(pk)
-        return Response({'message': "info complete"}, status=status.HTTP_200_OK)
+        item = Item.objects.filter(item_id=pk)
+        data = serializers.serialize("json", item)
+        json_data = json.loads(data)
+        res = json_data[0]['fields']
+        res['id']=json_data[0]['pk']
+        return Response({'data': res}, status=status.HTTP_200_OK)
 
     # url: items/11/
     # 마지막 slash도 써주어야함