feat: doi in readme, new group standard format

[yucongalicechen]

closes #174
@sbillinge ready for review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.31%. Comparing base (53ee55d) to head (50f76a1).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #180   +/-   ##
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  Coverage   99.31%   99.31%           
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  Files           5        5           
  Lines         292      292           
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  Hits          290      290           
  Misses          2        2           

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[sbillinge]

I removed #106 from the "closes" section as we still need to do this when we have a doi for the theory paper I think.

[yucongalicechen]

I removed #106 from the "closes" section as we still need to do this when we have a doi for the theory paper I think.

Thanks, I put up a new issue for it #179 for the 0.3.0 release.