Added Reference in README.md

README.md

@@ -63,3 +63,6 @@ class MyFixture{
 4. Head back to http://localhost:8070/MyFirstSlimTest and click on **Test** Menu link on top
 
 5. All tests should pass
+
+## Reference
+Head over to the [FitNesse Slim Documentation](http://docs.fitnesse.org/FitNesse.UserGuide.WritingAcceptanceTests.SliM) to learn more about creating acceptance tests.