hello.php

<?php
/**
 * Retrieve the widget title.
 *
 * @since 1.0.0
 *
 * @access public
 *
 * @return string Widget title.
 */
public function get_title() {
    return __( 'Addon Hello', 'addon_elementor' );
}

/**
 * Retrieve the widget icon.
 *
 * @since 1.0.0
 *
 * @access public
 *
 * @return string Widget icon.
 */
public function get_icon() {
    return 'eicon-insert-image';
}