Merge pull request #7766 from mgeier/doc-binder

DOC: Add README for Binder config files

binder/README

@@ -0,0 +1,15 @@
+This directory holds configuration files for https://mybinder.org/.
+
+A Binder instance can be launched by visiting this URL:
+
+https://mybinder.org/v2/gh/jupyterlab/jupyterlab/master?urlpath=lab-dev
+
+To check out a different version, just replace "master" with the desired
+branch/tag name or commit hash.
+
+Please note that this setup is developer focused.
+For a more user-focused Binder use this URL:
+
+https://mybinder.org/v2/gh/jupyterlab/jupyterlab-demo/master?urlpath=lab/tree/demo/Lorenz.ipynb
+
+If there is an error with the launched application, you can browse to the ` `/edit/jupyterlab-dev.log` url to see the server logs.

binder/requirements.txt

@@ -1 +1,3 @@
 jupyter-server-proxy
+matplotlib
+vega-datasets