Adding navigation menus

For now just add a file inside notes directory with name boot.php and add this contents-

<?php

$admin_note_sub_menus = [
    [
        'name' => 'Add Note',
        'link' => U.'notes/app/add/'
    ],
    [
        'name' => 'List Notes',
        'link' => U.'notes/app/list/'
    ]
];

add_menu_admin('Notes',U.'notes/app','notes','fa fa-file',2,$admin_note_sub_menus);