anchor.diff:  ### Flashcard (FlashcardWithoutId)
   + id: `12345678-9012-3456-7890-123456789012` (string, required) - Flashcard UUID, 36 chars, 8-4-4-4-12 chars
   + deckId: `291acb97-6f50-4522-8049-aee0b4e16b42` (string, required) - Deck UUID, 36 chars, 8-4-4-4-12 chars
  ++ questionImageURL: `http://www.sourcecertain.com/img/Example.png` (string, optional) - URL to image attached to this flashcard
  ++ answerImageURL: `http://www.sourcecertain.com/img/Example.png` (string, optional) - URL to image attached to this flashcard
   
   ### TipWithoutId (object)
   + essence: `Sample content` (string, required) - content of a Tip
  
positive.code: 
  + Response 201 (application/json)
  
  # Group CV
  
  ## Resources for CV server [/storage/{userId}/{fileId}]
  
  ### Get file[GET]
  This resource returns file from storage using userId and fileId
  
  + Response 200 (application/json)
  
  
negative.code:     This response is returned when tip was created.
  
      + Attributes (Tip)
      
  ### Get Tip by ID [GET /decks/{deckId}/flashcards/{flashcardId}/tips/{tipId}]
  
  + Response 200 (application/json)
  