add customer choice to readme

[juanitorduz]

Closes #1307

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📚 Documentation preview 📚: https://pymc-marketing--1326.org.readthedocs.build/en/1326/

[drbenvincent]

Looks good. Just a minor comment about wording consistency.

[juanitorduz]

Thanks, @drbenvincent. It's fixed! However, to make the pre-commit hook happy, we need to change the license year of all files :D 613fd59 . I think this is ok 🙏

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.14%. Comparing base (0764ac4) to head (613fd59).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1326      +/-   ##
==========================================
- Coverage   95.34%   95.14%   -0.21%     
==========================================
  Files          47       47              
  Lines        4963     4963              
==========================================
- Hits         4732     4722      -10     
- Misses        231      241      +10     

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