Update README.md

rm-code · web-flow · commit b5480063c464 · 2017-03-27T11:45:46.000+02:00
diff --git a/README.md b/README.md
@@ -63,3 +63,7 @@ end
 
 return MainScreen
 ```
+
+## Documentation
+
+An online documentation is available [here](http://rm-code.github.io/screenmanager/).
