Added Wordpress Course For hacktoberfest (#11286)

* Wordpress development course

* added the lint

* swap the line.

* wordpress development course

courses/free-courses-en.md

@@ -1780,6 +1780,7 @@
 * [How To Customize WooCommerce](https://www.youtube.com/playlist?list=PLTbrc9HXDstpihLrQIWtmExd9f1tiAYET) - WPTuts
 * [Jet Engine](https://www.youtube.com/playlist?list=PLHiQK7LHpKqThfbmEj3pf4YFmHv81GUwS) - Moxet Khan
 * [WordPress Basic to Advanced Course](https://www.youtube.com/playlist?list=PLQOGKy2nPhxlEVP4RBVrBoXPL6mZNZv5L) - Azharul Rafy
+* [WordPress Development](https://learn.rtcamp.com/courses/wordpress-development/) - rtCamp (HTML)
 * [WordPress Elementor Pro Tutorials](https://www.youtube.com/playlist?list=PLjR7HjmPoicEVCFa75468V_XVA47FLJO4) - Nayyar Shaikh
 * [WordPress Tips and Tricks](https://www.youtube.com/playlist?list=PLjR7HjmPoicHi7wS3JK2dGfBmoDFCg7o8) - Nayyar Shaikh