add constant

String const add

Implementation

static const String add =
    '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="20" height="20" preserveAspectRatio="xMidYMid meet" viewBox="0 0 20 20"><path fill="currentColor" d="M11 9V4H9v5H4v2h5v5h2v-5h5V9z"/></svg>';