Add Ruby on Rails a Beginners Guide Udemy course (#8574)

courses/free-courses-en.md

@@ -1155,6 +1155,7 @@
 * [Learn Rails: Quickly Code, Style and Launch 4 Web Apps](https://www.udemy.com/course/learn-rails) - Adam Eubanks (Udemy)
 * [Learn Ruby](https://www.learnrubyonline.org)
 * [RESTful API with Ruby On Rails 5](https://www.udemy.com/course/restful-api-with-ruby-on-rails-5/) - Udemy
+* [Ruby on Rails a Beginners Guide](https://www.udemy.com/course/ruby-on-rails-a-beginners-guide-free) - Stephen Chesnowitz (Udemy)
 * [Ruby Tutorial](https://www.w3resource.com/ruby/)
 * [RubyMonk - Interactive Ruby tutorials](https://rubymonk.com)