[es] New section (& book): Erlang

free-programming-books-es.md

@@ -16,6 +16,7 @@
 * [Coffeescript](#coffeescript)
 * [Emacs](#emacs)
 * [Ensamblador](#ensamblador)
+* [Erlang](#erlang)
 * [Git](#git)
 * [Haskell](#haskell)
 * [JavaScript](#javascript)
@@ -122,6 +123,10 @@
 * [Lenguaje Ensamblador para PC - Paul Carter](http://drpaulcarter.com/pcasm/)
 
 
+###Erlang
+* [Erlang/OTP: Un mundo concurrente](http://erlang-otp.es/)
+
+
 ###Git
 * [Git Immersion en Español](http://gitimmersion.mx)
 * [Gitmagic](http://www-cs-students.stanford.edu/~blynn/gitmagic/intl/es/)