[DOC] Update README.txt

[smehringer]

First version.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (b8cfb0f) to head (0dead5e).

❗ Current head 0dead5e differs from pull request most recent head fac7efd. Consider uploading reports for the commit fac7efd to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #79   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            2         2           
  Lines           28        28           
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  Hits            28        28           

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