code: public Appointment instantiateForInsert() {
          Appointment entity = new Appointment();
          entity.setCommunicationMethod("Phone");
          entity.setDateBegin(new DateTime());
          entity.setDateEnd(new DateTime());
          entity.setDescription("Test");
          entity.setIsDeleted(Boolean.FALSE);
          entity.setIsPrivate(Boolean.FALSE);
          entity.setNotificationMinutes(0);
          entity.setSubject("Test");
          entity.setType("Test");
          return entity;
      }
docs: Returns the entity with the required fields for an insert set.
  
  @return