renaming chapman mechanism and adding readme

[K20shores]

Closes #368

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.89%. Comparing base (85232c5) to head (df5422f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #583 +/- ## ======================================= Coverage 92.89% 92.89% ======================================= Files 49 49 Lines 3477 3477 ======================================= Hits 3230 3230 Misses 247 247 ```

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