add sit23 as a contributor for example

[allcontributors]

Adds @sit23 as a contributor for example.

This was requested by tkoyama010 in this comment

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.28%. Comparing base (4ce7551) to head (7b3357d).
Report is 138 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1044   +/-   ##
=======================================
  Coverage   91.28%   91.28%           
=======================================
  Files          58       58           
  Lines        2936     2936           
=======================================
  Hits         2680     2680           
  Misses        256      256           

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