docs: Fill in docs

[danvk]

Overview

Update README.md to explain how this repo diverges from the book.

[github-actions]

PR Compliance Checks

Thank you for your Pull Request! We have run several checks on this pull request in order to make sure it's suitable for merging into this project. The results are listed in the following section.

Issue Reference

In order to be considered for merging, the pull request description must refer to a specific issue number. This is described in our Contributing Guide. We are closing this pull request for now but you can update the pull request description and reopen the pull request.
The check is looking for a phrase similar to: "Fixes #XYZ" or "Resolves #XYZ" where XYZ is the issue number that this PR is meant to address.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (057d646) 97.73% compared to head (b44c266) 97.73%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #46   +/-   ##
=======================================
  Coverage   97.73%   97.73%           
=======================================
  Files          17       17           
  Lines        2032     2032           
  Branches      339      339           
=======================================
  Hits         1986     1986           
  Misses         45       45           
  Partials        1        1           

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