add doc for provider package

[ktong]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (3199c2d) 92.80% compared to head (9d97df8) 92.80%.

❗ Current head 9d97df8 differs from pull request most recent head 4a43437. Consider uploading reports for the commit 4a43437 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #21   +/-   ##
=======================================
  Coverage   92.80%   92.80%           
=======================================
  Files          13       13           
  Lines         445      445           
=======================================
  Hits          413      413           
  Misses         23       23           
  Partials        9        9           

Impacted Files	Coverage Δ
provider/file/file.go	100.00% <ø> (ø)
provider/flag/flag.go	91.42% <ø> (ø)
provider/env/env.go	100.00% <100.00%> (ø)
provider/env/option.go	100.00% <100.00%> (ø)
provider/flag/option.go	100.00% <100.00%> (ø)

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