added a message about Qunit

Author: liammclennan

README

@@ -2,4 +2,6 @@ JavaScript Koans is an interactive learning environment that uses failing tests
 
 The inspiration for this project comes from the Edgecase Ruby Koans and the book 'Javascript: The Good Parts'.
 
-Open the file jskoans.htm in your favourite browser and make the tests pass.
+Open the file jskoans.htm in your favourite browser and make the tests pass.
+
+The koans use the [Qunit](http://docs.jquery.com/Qunit) test syntax and test runner.