add binder link

Author: zingale

README.md

@@ -1,4 +1,5 @@
-[![Build Status](https://travis-ci.com/python-hydro/pyro2.svg?branch=master)](https://travis-ci.com/python-hydro/pyro2) [![Documentation Status](https://readthedocs.org/projects/pyro2/badge/?version=latest)](https://pyro2.readthedocs.io/en/latest/?badge=latest)
+[![Build Status](https://travis-ci.com/python-hydro/pyro2.svg?branch=master)](https://travis-ci.com/python-hydro/pyro2) [![Documentation Status](https://readthedocs.org/projects/pyro2/badge/?version=latest)](https://pyro2.readthedocs.io/en/latest/?badge=latest) [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/python-hydro/pyro2/master?filepath=examples%2Fexamples.ipynb)
+
 
 ![pyro logo](www/logo.gif)