code: public ResponseBuilder withSimpleCard(String cardTitle, String cardText) {
          this.card = SimpleCard.builder()
                  .withContent(cardText)
                  .withTitle(cardTitle)
                  .build();
          return this;
      }
docs: Sets a simple {@link Card} on the response with the specified title and content.
  
  @param cardTitle title for card
  @param cardText text in the card
  @return response builder