Fill out README.rst and add screenshots.

setup.py: use more recent Mathics

Author: rocky

.gitignore

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 *~
 /.python-version
+/ChangeLog
 /pymathics_graph.egg-info
 __pycache__

README.rst

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-Mathics Graph Module
+`Mathics <https://mathics.org>`_ Graph Module using `NetworkX <https://networkx.org/>`_ and `Matplotlib <https://matplotlib.org>`_
+
+::
+
+Example Session
+---------------
+
+::
+
+   $ mathicsscript
+   Mathics 1.1.1
+   on CPython 3.6.12 (default, Oct 24 2020, 10:34:18)
+   using SymPy 1.8.dev, mpmath 1.1.0, cython 0.29.21
+
+   Copyright (C) 2011-2020 The Mathics Team.
+   This program comes with ABSOLUTELY NO WARRANTY.
+   This is free software, and you are welcome to redistribute it
+   under certain conditions.
+   See the documentation for the full license.
+
+   Quit by pressing CONTROL-D
+
+   In[1]:= LoadModule["pymathics.graph"]
+   Out[1]= pymathics.graph
+   In[2]:= BinomialTree[3]
+   In[3]:= BinomialTree[6]
+   In[4]:= CompleteKaryTree[3, VertexLabels->True]
+   In[5]:= CompleteKaryTree[6]
+
+Screenshots
+-----------
+
+|screenshot|
+
+The above is the is the matplotlib graph for ``BinomialTree[3]`` in the session above.
+
+See the `screenshot directory <https://github.com/Mathics3/pymathics-graph/tree/master/screenshots>`_ the other graphs.
+
+Installation
+-------------
+
+From pip:
+
+::
+
+   $ pip install pymathics-graph
+
+From git:
 
 ::
 
    $ make develop  # or make install
 
+Note:
+-----
+
+Currently this works well in `mathicsscript` but not in the Django interface, although graphs are created in a temporary directory, e.g. ``/tmp/``.
+
 
+.. |screenshot| image:: https://github.com/Mathics3/pymathics-graph/blob/master/screenshots/BinomialTree-3.png