Added JavaScript/Redux (#2688)

* Added JavaScript/Redux 

1. Added new section to JavaScript (Redux) 
2. Add the "The Complete Redux Book" to the list

* add required spaces, add account required notation

free-programming-books.md

@@ -78,6 +78,7 @@
   * [Javascript frameworks](#javascript-frameworks)
   * [Node.js](#nodejs)
   * [React.js](#reactjs)
+  * [Redux](#redux)
 * [Jenkins](#jenkins)
 * [Julia](#julia)
 * [Language Agnostic](#language-agnostic)
@@ -1457,6 +1458,11 @@ For resources on Angular, Backbone, D3, Dojo, Ember, Express, jQuery, Knockout,
 * [The Road to learn React - Build a Hacker News App along the Way](https://leanpub.com/the-road-to-learn-react), [Open Source](https://github.com/rwieruch/the-road-to-learn-react)
 
 
+#### Redux
+
+* [The Complete Redux Book](https://leanpub.com/redux-book) - Boris Dinkevich and Ilya Gelman *(Leanpub Account Required)*
+
+
 ### Jenkins
 
 * [Jenkins: The Definitive Guide](http://www.bogotobogo.com/DevOps/Jenkins/images/Intro_install/jenkins-the-definitive-guide.pdf) (PDF)