Add .codecov.yml

[thomaswilliamsastro]

• Add .codecov.yml

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 6.27%. Comparing base (a573ba9) to head (a88e050).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #364   +/-   ##
======================================
  Coverage    6.27%   6.27%           
======================================
  Files          38      38           
  Lines       15232   15232           
  Branches     3660    3660           
======================================
  Hits          956     956           
  Misses      14262   14262           
  Partials       14      14           

Components	Coverage Δ
casa	4.92% <ø> (ø)
handler	6.33% <ø> (ø)
spectral-cube	7.19% <ø> (ø)
utils	5.25% <ø> (ø)

[thomaswilliamsastro]

@low-sky this is now ready for review. It's just a little bit of infrastructure for testing