readme for demo

demo/README.rst

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+=============================
+Tensorflow Unet demos
+=============================
+
+.. image:: https://mybinder.org/badge.svg
+        :target: https://mybinder.org/v2/gh/jakeret/tf_unet/binder?filepath=demo%2Fdemo_toy_problem.ipynb
+
+
+
+Here you can find demo Jupyter notebooks for a `toy problem <https://github.com/jakeret/tf_unet/blob/master/demo/demo_toy_problem.ipynb>`_ or the `Radio Frequency Interference mitigation <https://github.com/jakeret/tf_unet/blob/master/demo/demo_radio_data.ipynb>`_ discussed in our paper.
+
+
+You can use the binder badge to start an interactive version of the toy problem without having to install anything on your machine.