🔧 Add basic codecov config

[s-weigand]

Just a basic config so codecov won't annoy us with meaningless failed patch checks all the time.

Change summary

• 🔧 Add basic codecov config

Checklist

• ✔️ Passing the tests (mandatory for all PR's)

[github-actions]

👈 Launch a binder notebook on branch s-weigand/pyglotaran-extras/add-codecov-config

[codecov]

Codecov Report

Merging #97 (ab7cbaf) into main (295c955) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #97   +/-   ##
=======================================
  Coverage   40.18%   40.18%           
=======================================
  Files          23       23           
  Lines         662      662           
  Branches       96       96           
=======================================
  Hits          266      266           
  Misses        396      396           

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