Add IndexSeries Tutorial

[lawrence-mbf]

Related to #532

Motivation

Copy index series from equivalent pynwb tutorial

How to test the behavior?

see HTML page

Checklist

• [x] Have you ensured the PR description clearly describes the problem and solutions?
• [x] Have you checked to ensure that there aren't other open or previously closed Pull Requests for the same change?
• [x] If this PR fixes an issue, is the first line of the PR description fix #XX where XX is the issue number?

[codecov[bot]]

Codecov Report

Merging #537 (0f60e71) into master (68c9e12) will not change coverage. Report is 3 commits behind head on master. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #537   +/-   ##
=======================================
  Coverage   87.69%   87.69%           
=======================================
  Files         132      132           
  Lines        5609     5609           
=======================================
  Hits         4919     4919           
  Misses        690      690           

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