highlight(cfiRange, data, cb, className, styles) {
    return this.add("highlight", cfiRange, data, cb, className, styles);
  }
Add a highlight to the store
@param {EpubCFI} cfiRange EpubCFI range to attach annotation to
@param {object} data Data to assign to annotation
@param {function} cb Callback after annotation is clicked
@param {string} className CSS class to assign to annotation
@param {object} styles CSS styles to assign to annotation