binder link

README.md

@@ -4,4 +4,6 @@ This is the git repository for a binder environment with the Python and Julia
 
 (In the future, we plan to add a [repo2docker Github Action](https://github.com/jupyterhub/repo2docker-action) to automatically build push changes to dockerhub and speed up the launch of binder.)
 
-To create a link to load notebooks in a particular course, use [nbgitpuller](https://github.com/jupyterhub/nbgitpuller), similar to [this example](https://github.com/gvarnavi/binder-env_py-3.8_jl-1.6_wl-12.2).
+To create a link to load notebooks in a particular course, use [nbgitpuller](https://github.com/jupyterhub/nbgitpuller), similar to [this example](https://github.com/gvarnavi/binder-env_py-3.8_jl-1.6_wl-12.2).  Click the following link just to open the "bare" binder environment for this repo with no notebooks:
+
+[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/mitmath/binder-env/main)