Added git omands to readme.

README.adoc

@@ -19,6 +19,10 @@ The syntax is asciidoc :
 *  link:http://asciidoctor.org/docs/asciidoc-syntax-quick-reference/[Asciidoc Syntax Quick Reference]
 *  link:http://asciidoctor.org/docs/user-manual/#introduction-to-asciidoctor[Asciidoctor User Manual]
 
+An easy to use primer for GitHub commands can be found here:
+
+*  link:http://rogerdudler.github.io/git-guide/[git - the simple guide] 
+
 
 == Contribute