tutorials for optogenetics

[bendichter]

Motivation

Add tutorial for ogen module

Checklist

• Did you update CHANGELOG.md with your changes?
• Have you checked our Contributing document?
• Have you ensured the PR clearly describes the problem and the solution?
• Is your contribution compliant with our coding style? This can be checked running flake8 from the source directory.
• Have you checked to ensure that there aren't other open Pull Requests for the same change?
• Have you included the relevant issue number using "Fix #XXX" notation where XXX is the issue number? By including "Fix #XXX" you allow GitHub to close issue #XXX when the PR is merged.

[codecov]

Codecov Report

Merging #1657 (12e4164) into dev (1d669b0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #1657   +/-   ##
=======================================
  Coverage   91.99%   91.99%           
=======================================
  Files          26       26           
  Lines        2587     2587           
  Branches      497      497           
=======================================
  Hits         2380     2380           
  Misses        132      132           
  Partials       75       75           

Flag	Coverage Δ
integration	71.55% <ø> (ø)
unit	83.61% <ø> (ø)

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