Merge pull request #965 from esparta/master

[en] Adding misc. book

free-programming-books.md

@@ -389,6 +389,7 @@
 * [PNG: The Definitive Guide](http://www.libpng.org/pub/png/book/)
 * [Pointers And Memory](http://cslibrary.stanford.edu/102/PointersAndMemory.pdf) (PDF)
 * [Programmer's Motivation for Beginners](http://programmersmotivation.com/)
+* [Programming with Unicode](http://unicodebook.readthedocs.org/)
 * [Project Oberon](http://www-old.oberon.ethz.ch/WirthPubl/ProjectOberon.pdf) (PDF)
 * [Record-Playback Test Automation: Sahi & Selenium IDE: Critical Evaluation of Record-Playback Automation Tools](https://leanpub.com/manualToAutomatedWithSeleniumIDEAndSahi) - Shashikant Jagtap
 * [SVG Essentials](http://commons.oreilly.com/wiki/index.php/SVG_Essentials)