code: public static function avatar($src, $options = [])
      {
          Ui::addCssClasses($options, ['ui', 'avatar', 'image']);
          return Ui::img($src, $options);
      }
docs: Renders an [avatar image](http://semantic-ui.com/elements/image.html#avatar)
  
  @param string $src the image source
  @param array $options the tag options in terms of name-value pairs
  
  @return string the generated avatar tag