Added createdAt field in api call

Author: kailash360

src/services/user_story.js

@@ -86,6 +86,7 @@ const userStory = {
                   username
                 }
                 Category
+                createdAt
               }
             }
             `
@@ -111,6 +112,7 @@ const userStory = {
             id
             url
           }
+          createdAt
         }
       }
       ${BASIC_STORY_INFO_FRAGMENT}