Create codecov.yml for coverage testing (Do not merge)

[bobleesj]

Addressing #85

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.38%. Comparing base (b5a0366) to head (e41e218).

Additional details and impacted files

@@            Coverage Diff             @@
##            main      #86       +/-   ##
==========================================
+ Coverage   0.00%   93.38%   +93.38%     
==========================================
  Files          9        6        -3     
  Lines        240      136      -104     
==========================================
+ Hits           0      127      +127     
+ Misses       240        9      -231     

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[Tieqiong]

Well this is not good (still having 0%). We might have to look into .coveragerc and codecov.yml

[bobleesj]

This is for testing to initiate GitHub Actions.

I think I've figured out the problem.

[bobleesj]

@Tieqiong We shall use pytest-cov instead of using coverage to run pytest. The previous error occurred because the tests folder has been moved to the top directory level and coverage isn't able to import diffpy.snmf due to the namespace.

[bobleesj]

It runs now. Will chat more tomorrow.

[bobleesj]

Closing this PR since the new workflow indeeds works for diffpy.utils's codecov.