How can i set icon on custom plugin in wordpress

I have already create my custom plugin but wordpress show me default icon in dashboard. So how can i change plugin icon? i have try to :

<? /*
      Plugin Name: Rawin Plugin
      Description: Plugin for testing purpose 
      Version: 1
      Author: Rahul Dabhi
      Author URI: 
     */
?>

can i change in this section? please answer me as soon as possible. Thank you