add link to backbone.js guide

README.md

@@ -5,6 +5,7 @@ This repository contains all code samples from the Java 8 Tutorials of my blog:
 
 - http://winterbe.com/posts/2014/03/16/java-8-tutorial/
 - http://winterbe.com/posts/2014/04/05/java8-nashorn-tutorial/
+- http://winterbe.com/posts/2014/04/07/using-backbonejs-with-nashorn/
 
 I'm adding new samples from time to time, but feel free to fork and try it yourself.