<?php
/*
 * Plugin Name: Wordpress Admin Menu
 * Description: 관리자 메뉴 생성 예제 플러그인
 * Version:   1.0.0
 * Author:    HiSEON
 * Author URI:  https://hiseon.me/
 */

add_action('admin_menu', 'my_admin_menu');

/*
 *  * https://developer.wordpress.org/reference/functions/add_menu_page/
 *   */
function my_admin_menu() {
  add_menu_page('페이지 상단제목', '버튼이름', 'manage_options', 'my_plugin_index',
    'my_index_page', 'dashicons-chart-area');
}

function my_index_page() {
    echo "hello, world";
}