Solution:
Here is a way to add custom content on a front-end page when you create your plugin: http://blog.frontendfactory.com/how-to-create-front-end-page-from-your-wordpress-plugin/
function elegance_referal_init()
{
if(is_page('share')){
$dir = plugin_dir_path( __FILE__ );
include($dir."frontend-form.php");
die();
}
}
add_action( 'wp', 'elegance_referal_init' );