Create example document - convert BIDS -> run pyautomagic

[adam2392]

Describe the bug
Assuming the package works as expected, there should be an example document showing users how to:

1. convert EDF (or other EEG datafile) into BIDS
2. use mne_bids.read_raw_bids to read in the Raw data structure
3. run through pyautomagic
4. look at bids_root/derivatives for the corresponding automagic created derivatives (see paper)

Expected behavior
Should be in the form of a .py script file that looks like mne-bids (see mne-bids package examples/). Should be rendered as expected.

• correct formatting
• correct rendering
• coherent example