Create Admin Menu In Wordpress Admin

add_action( 'admin_menu', 'add_subscribed_user_list' );

function add_subscribed_user_list()
{
    add_menu_page(
        'Subscribed Users', 
        'Subscribed Users', 
        'manage_options',  
        'user-list', 
        'add_subscribed_users_list',
        null,
        28
    );
}
function add_subscribed_users_list()
{
    global $title;    
    print '<div class="wrap">';
    print "<h1>$title</h1>";
    $file = get_template_directory(). "/subscribe/subscribed-list.php";
    if ( file_exists( $file ) )
        require $file;

    print '</div>';
}