update readme

Author: akaszynski

README.md

@@ -17,3 +17,11 @@ mapdlhelm.azurecr.io/jupyterlab_base:$VERSION
 
 Obtain docker login credentials by following the steps at:
 https://portal.azure.com/#@ansys.com/resource/subscriptions/2870ae10-53f8-46b1-8971-93761377c38b/resourceGroups/PyANSYS/providers/Microsoft.ContainerRegistry/registries/mapdlhelm
+
+
+#### Notes
+ - We're currently using a custom image of pyvista at the moment, and
+   this needs to be upgraded to the latest pyvista release.
+ - GPU image on dev.pyansys.com contains additional GPU remote
+   rendering features not included in this image.  Ping @akaszynski to
+   create that branch.