add html5 book

Book HTML5 Shoot 'em Up in an Afternoon - Bryan Bibat 
Complete source of the book: https://github.com/bryanbibat/html5shootemupinanafternoon 
After one click on the button "add ebook to cart" it's freely avaliable in thiese formats: pdf, epub, mobi and also this book purchase comes with a zip file containing extras!

free-programming-books.md

@@ -1177,6 +1177,7 @@ Original Source: [List of freely available programming books](http://web.archive
 * [HTML5 Canvas](http://chimera.labs.oreilly.com/books/1234000001654/index.html) - Steve Fulton & Jeff Fulton
 * [HTML5 for Publishers](http://chimera.labs.oreilly.com/books/1234000000770/index.html) - Sanders Kleinfeld
 * [HTML5 For Web Designers](http://html5forwebdesigners.com) - Jeremy Keith
+* [HTML5 Shoot 'em Up in an Afternoon](https://leanpub.com/html5shootemupinanafternoon/read) - Bryan Bibat
 * [Learn CSS Layout](http://learnlayout.com)
 * [Learn CSS Layout the pedantic way](http://book.mixu.net/css/)
 * [Scalable and Modular Architecture for CSS](https://smacss.com) - Jonathan Snook