Added "Basics of compiler design" by Torben Mogensen

free-programming-books.md

@@ -208,6 +208,7 @@
 * [Linkers and loaders](http://www.iecc.com/linker/)
 * [Compiler Design: Theory, Tools, and Examples](http://elvis.rowan.edu/~bergmann/books.html)
 * [Practical and Theoretical Aspects of Compiler Construction](http://www.stanford.edu/class/archive/cs/cs143/cs143.1128/) (class lectures and slides)
+* [Basics of compiler design](http://www.diku.dk/~torbenm/Basics/) - Torben Mogensen
 
 ####Programming Paradigms
 * [Introduction to Functional Programming](http://www.cl.cam.ac.uk/teaching/Lectures/funprog-jrh-1996/) (class lectures and slides)