add sidebar menu option wp
/**
* Register a custom menu page.
*/
function wpdocs_register_my_custom_menu_page() {
add_menu_page(
__( 'Custom Menu Title', 'textdomain' ),
'custom menu',
'manage_options',
'myplugin/myplugin-admin.php',
'',
plugins_url( 'myplugin/images/icon.png' ),
6
);
}
add_action( 'admin_menu', 'wpdocs_register_my_custom_menu_page' );