Add example to readme docs

[charleskawczynski]

This PR updates the readme, and provides an example.

Closes #189.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.40%. Comparing base (ffbbe72) to head (98a80ed).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #142      +/-   ##
==========================================
- Coverage   90.93%   90.40%   -0.53%     
==========================================
  Files          10        9       -1     
  Lines        1180     1167      -13     
==========================================
- Hits         1073     1055      -18     
- Misses        107      112       +5     

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[glwagner]

It might be nice for clarity to show what the parameters are in this example, or at least give an example of inspecting the struct to find the parameters (since they cannot be determined by reading the code). We should also show users how to change the parameters.

[charleskawczynski]

Thoughts on merging this and iterating? I think that this is an improvement.