Add .codecov.yml and README badges

[fpseverino]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.29%. Comparing base (054c12f) to head (7ebb28f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
+ Coverage   88.91%   91.29%   +2.38%     
==========================================
  Files           8        6       -2     
  Lines         523      356     -167     
==========================================
- Hits          465      325     -140     
+ Misses         58       31      -27     

Files with missing lines	Coverage Δ
Sources/AppleMapsKit/AppleMapsKitError.swift	100.00% <ø> (+15.38%)	⬆️
...ces/AppleMapsKit/Authorization/TokenResponse.swift	100.00% <ø> (+38.46%)	⬆️

... and 5 files with indirect coverage changes