Add Books

Add  Canvassing and Learn CSS Layout the pedantic way to HTML & CSS section.

free-programming-books.md

@@ -1163,6 +1163,7 @@ Original Source: [List of freely available programming books](http://web.archive
 * [A free guide to learn HTML and CSS](http://marksheet.io)
 * [Adaptive Web Design](http://adaptivewebdesign.info/1st-edition/) - Aaron Gustafson
 * [An advanced guide to HTML&CSS](http://learn.shayhowe.com/advanced-html-css/)
+* [Canvassing](http://learnjs.io/canvassing/read)
 * [Code Guide: Standards for developing flexible, durable, and sustainable HTML and CSS](http://mdo.github.io/code-guide/) - Mark Otto
 * [Dive Into HTML5](http://diveintohtml5.info) - Mark Pilgrim ([PDF](http://mislav.net/2011/10/dive-into-html5/))
 * [GA Dash](https://dash.generalassemb.ly)
@@ -1173,6 +1174,7 @@ Original Source: [List of freely available programming books](http://web.archive
 * [HTML5 for Publishers](http://chimera.labs.oreilly.com/books/1234000000770/index.html) - Sanders Kleinfeld
 * [HTML5 For Web Designers](http://html5forwebdesigners.com) - Jeremy Keith
 * [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
 * [Web Audio API](http://chimera.labs.oreilly.com/books/1234000001552) - Boris Smus