feat: support create comment on a pr

[LinuxSuRen]

No description provided.

[codecov]

Codecov Report

Merging #15 (2230f15) into master (7a99b76) will decrease coverage by 4.27%.
The diff coverage is 31.57%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
- Coverage   42.27%   37.99%   -4.28%     
==========================================
  Files           5        6       +1     
  Lines         220      279      +59     
==========================================
+ Hits           93      106      +13     
- Misses        127      173      +46     

Flag	Coverage Δ
unittests	37.99% <31.57%> (-4.28%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/git.go	9.47% <0.00%> (-5.29%)	⬇️
cmd/comment.go	47.82% <47.82%> (ø)
cmd/status.go	75.86% <92.30%> (+0.86%)	⬆️
cmd/root.go	100.00% <100.00%> (ø)

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