Update README.md

README.md

 # zarr-in-swift-objectstorage
 
+## Service
+
+On a Openstack VM, we run a jupyter server with the extension [appmode](https://jupyter-tutorial.readthedocs.io/de/latest/web/dashboards/appmode/index.html). This allows to provide notebooks as interactive webapps.
+
+We developped such a showcase service for **tzis** where the source data comes from a lustre-directory. When you are in the DKRZ internal network (via vpn), you can reach:
+http://jupyter-appmode.cloud.dkrz.de:8888/apps/tzis-service.ipynb
+
+You have to put in a password which you can get by request from the DM team.
+You will get the output of the notebook provided in notebooks/tzis-service.ipynb.
+
 ## Installation
 ```
 pip install git+https://gitlab.dkrz.de/mipdata/python_package_zarr_in_swift.git#egg=tzis