public function addLink(
            string $label, 
            string $url, 
            bool $active       = false, 
            bool $disabled     = false, 
            string $icon       = null, 
            string $iconColor  = null, 
            string $badge      = null, 
            string $badgeColor = null)
    {
        Checkers::checkUrl($url);
        $this->items[] = [
            'label'    => $label, 
            'url'      => $url, 
            'active'   => $active, 
            'disabled' => $disabled,
            'icon'     => $icon,
            'icolor'   => $iconColor,
            'badge'    => $badge,
            'bcolor'   => $badgeColor
        ];
        return $this;
    }