code: public int addField(int appId, ApplicationFieldCreate field) {
  		return getResourceFactory().getApiResource("/app/" + appId + "/field/")
  				.entity(field, MediaType.APPLICATION_JSON_TYPE)
  				.post(ApplicationFieldCreateResponse.class).getId();
  	}
docs: Adds a new field to an app
  
  @param appId
  The id of the the field should be added to
  @param field
  The definition of the new field
  @return The id of the newly created field