Add frontend armory react course (#7218)

* Add frontend armory react course

* Completing with instructor

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

courses/free-courses-en.md

@@ -632,6 +632,7 @@
 
 #### React
 
+* [Frontend Armory: React Fundamentals](https://frontarm.com/courses/react-fundamentals/) - James K. Nelson
 * [Full Modern React Tutorial](https://www.youtube.com/playlist?list=PL4cUxeGkcC9gZD-Tvwfod2gaISzfRiP9d) - The Net Ninja (with practical)
 * [Full-Stack Web Development with React Specialization](https://www.coursera.org/specializations/full-stack-react) - Jogesh K. Muppala (Coursera)
 * [React](https://progate.com/languages/react) (progate) *(account required)*