use Sau\WP\SettingsAPI\SettingsGroup;

$group_id='pages';
$group_title='Страницы';
$page_id='reading';
$setting_group = new SettingsGroup($group_id,$group_title,$page_id);

Add fields

$setting_group = new SettingsGroup( ... );

$setting_group
    ->addField(new UrlField($id, $title));
    //->addField(new TextField($id, $title));
    //->addField(new SelectField($id, $title));
    //->addField(new PasswordField($id, $title));
    //->addField(new PageListField($id, $title));
    //->addField(new EmailField($id, $title));