[es] Adding jQuery to the list

Adding the jQuery section, and also adding a book abut that.

free-programming-books-es.md

@@ -18,6 +18,7 @@
 * [Git](#git)
 * [Haskell](#haskell)
 * [JavaScript](#javascript)
+    * [jQuery] (#jquery) 
     * [node.js](#nodejs)
 * [Java](#java)
 * [LaTeX](#latex)
@@ -136,6 +137,10 @@
 * [Jardín de JavaScript](http://bonsaiden.github.io/JavaScript-Garden/es)
 
 
+####jQuery
+* [Fundamentos de jQuery](http://librojquery.com/)
+
+
 ####Node.js
 * [Introducción a Node.js a través de Koans](http://nodejskoans.com/)
 * [El Libro para Principiantes en Node.js](http://www.nodebeginner.org/index-es.html)