Add JupyterLab example

(c) Copyright IBM Corp. 2016

examples/jupyterlab/Dockerfile

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+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+
+FROM jupyter/scipy-notebook:18e5563b7486
+
+# Install jupyterlab
+RUN conda install -c conda-forge jupyterlab
+RUN jupyter serverextension enable --py jupyterlab --sys-prefix
+
+USER jovyan

examples/jupyterlab/README.md

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+# JupyterLab Example
+
+This is an example of using JupyterLab as the single-user Notebook server image with JupyterHub.  The example builds a Docker image that installs the `jupyterlab` notebook server extension.
+
+## Build the Image
+
+Build and tag the image using the `Dockerfile` in this directory.
+
+```
+docker build -t jupyterlab .
+```
+
+## Run JupyterHub Container
+
+To have JupyterHub spawn the `jupyterlab` image for single-user Notebook
+servers, set the following environment variables before you run the JupyterHub container.
+
+```
+export DOCKER_NOTEBOOK_IMAGE=jupyterlab
+export DOCKER_SPAWN_CMD="start-singleuser.sh --SingleUserNotebookApp.default_url=/lab"
+```
+
+Then run the following **from the root directory** of this repository:
+
+```
+# bring down the JupyterHub container, if running
+docker-compose down
+
+# bring it back up
+docker-compose up -d
+```