Merge pull request #1535 from iKenshu/add-mooc

Add mooc

free-programming-books.md

@@ -480,6 +480,7 @@ Original Source: [Free Programming books](http://stackoverflow.com/revisions/392
 * [FutureLearn](https://www.futurelearn.com/)
 * [MIT OCW](http://ocw.mit.edu/OcwWeb/web/home/home/index.htm)
 * [NPTEL](http://nptel.ac.in/courses.php?disciplineId=106)
+* [Platzi](https://courses.platzi.com/)
 * [Udacity](https://www.udacity.com/)