added Machine Language for Beginners

free-programming-books.md

@@ -363,6 +363,7 @@
 
 ####Non-X86
 * [Machine Code for Beginners](http://www.worldofspectrum.org/infoseekid.cgi?id=2000227) (PDF) by Lisa Watts and Mike Wharton
+* [Machine Language for Beginners](http://archive.org/details/ataribooks-machine-language-for-beginners) by Richard Mansfield
 
 
 ###Bash