Added Jenkins Book

free-programming-books.md

@@ -62,6 +62,7 @@
 * [JavaScript](#javascript)
     * [Javascript frameworks](#javascript-frameworks)
     * [Node.js](#nodejs)
+* [Jenkins](#jenkins)
 * [Language Agnostic](#language-agnostic)
     * [Algorithms & Datastructures](#algorithms--data-structures)
     * [Cellular Automata](#cellular-automata)
@@ -1082,6 +1083,10 @@ For resources on Angular.js, Backbone.js, D3.js, Dojo, Ember.js, Express.js, jQu
 * [Node.js Succinctly, Syncfusion](http://www.syncfusion.com/resources/techportal/ebooks/nodejs) (PDF, Kindle) *(Just fill the fields with any values)*
 
 
+###Jenkins
+* [Jenkins: The Definitive Guide](http://it-ebooks.info/book/576/) (PDF)
+
+
 ###LaTeX
 * [The Not So Short Introduction to LaTeX](http://tobi.oetiker.ch/lshort/lshort.pdf) (PDF)
 * [LaTeX Wikibook](http://en.wikibooks.org/wiki/LaTeX)