Add Learn Rails: Quickly Code, Style and Launch 4 Web Apps course (#7878)

* Add Learn Rails: Quickly Code, Style and Launch 4 Web Apps course

* Author added

courses/free-courses-en.md

@@ -1070,6 +1070,7 @@
 * [An Introduction to Ruby Programming Language](https://www.researchgate.net/publication/322222154_An_Introduction_to_Ruby_Programming_Language) - Ali Tourani (HTML, PDF)
 * [Full Stack Ruby on Rails](https://www.theodinproject.com/paths/full-stack-ruby-on-rails) - The Odin Project
 * [Learn how to program: Ruby](https://www.learnhowtoprogram.com/ruby) - Epicodus Inc.
+* [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 Tutorial](https://www.w3resource.com/ruby/)