Merge pull request #1380 from superruzafa/master

Add Visual Scala Reference to learn page

Author: julienrf

learn.md

@@ -52,3 +52,6 @@ There are a handful of websites where you can interactively run Scala code in yo
 
 ## ScalaCourses
 [Independent Courseware](http://getscala.com), online self-study or instructor-led Scala and Play courses for a fee.
+
+## Visual Scala Reference
+[Visual Scala Reference](https://superruzafa.github.com/visual-scala-reference/), a guide to visually learn about Scala concepts and functions.