Merge pull request #1045 from estrabd/master

Added NKS to Cellular Automata Book list

free-programming-books.md

@@ -262,6 +262,7 @@
 
 ####Cellular Automata
 * [Cellular Automata Books](http://uncomp.uwe.ac.uk/genaro/Cellular_Automata_Repository/Books.html)
+* [A New Kind of Science](https://www.wolframscience.com/nksonline/toc.html) - Stephen Wolfram
 
 
 ####Cloud Computing