<commit_before>This example can be run via the script::

   python chaos_pendulum.py

or the Jupyter notebook::

   jupyter notebook
<commit_msg>Updated readme with figure and the run.py instructions.<commit_after>This is an example of a simple two body pendulum that exhibits chaotic
behavior. The following diagram describes the system:

![free body diagram](chaos_pendulum.svg)

This example can be run with::

   python run.py

or withing a Jupyter notebook with::

   python run.py --notebook

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