WordPress RSS feeds are built right into the platform. You just need to know how to use them properly, which is what this tutorial is about. You’ll be able to create an RSS feed for the whole site or each category individually.
Here’s the script:
Remember to change the image URL in the script so that it links to an image on your site.
<?php wp_list_categories('feed_image=http://wp-phd.com/wp-content/uploads/2017/05/rss.gif&feed=XML Feed'); ?>