code: public int addItem(int appId, ItemCreate create, boolean silent) {
  		return getResourceFactory().getApiResource("/item/app/" + appId + "/")
  				.queryParam("silent", silent ? "1" : "0")
  				.entity(create, MediaType.APPLICATION_JSON_TYPE)
  				.post(ItemCreateResponse.class).getId();
  	}
docs: Adds a new item to the given app.
  
  @param appId
  The id of the app the item should be added to
  @param create
  The data for the new item
  @param silent
  True if the create should be silten, false otherwise
  @return The id of the newly created item