Add .codecov.yml

[thomaswilliamsastro]

• Add .codecov.yml

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 6.28%. Comparing base (b90495d) to head (908a75e).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #364   +/-   ##
======================================
  Coverage    6.28%   6.28%           
======================================
  Files          38      38           
  Lines       15209   15209           
  Branches     3654    3654           
======================================
  Hits          956     956           
  Misses      14239   14239           
  Partials       14      14           

Components	Coverage Δ
casa	4.94% <ø> (ø)
handler	6.33% <ø> (ø)
spectral-cube	7.19% <ø> (ø)
utils	5.25% <ø> (ø)