feat: 🎸 add docs command

[sunny0826]

✅ Closes: #830

[the-label-bot]

The Label Bot has predicted the following:

Category	Value	Confidence	Applied Label
Kind	documentation	0.888	✔️
Size	M	0.939	✔️

[codecov]

Codecov Report

Attention: 36 lines in your changes are missing coverage. Please review.

Comparison is base (42d206a) 19.18% compared to head (5fa4834) 18.87%.

Files	Patch %	Lines
cmd/docs.go	0.00%	24 Missing ⚠️
cmd/add.go	0.00%	1 Missing ⚠️
cmd/alias.go	0.00%	1 Missing ⚠️
cmd/clear.go	0.00%	1 Missing ⚠️
cmd/cloud.go	0.00%	1 Missing ⚠️
cmd/cmd.go	0.00%	1 Missing ⚠️
cmd/delete.go	0.00%	1 Missing ⚠️
cmd/export.go	0.00%	1 Missing ⚠️
cmd/list.go	0.00%	1 Missing ⚠️
cmd/merge.go	0.00%	1 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #839      +/-   ##
==========================================
- Coverage   19.18%   18.87%   -0.32%     
==========================================
  Files          20       21       +1     
  Lines        2220     2257      +37     
==========================================
  Hits          426      426              
- Misses       1754     1791      +37     
  Partials       40       40              

Flag	Coverage Δ
unittests	18.87% <0.00%> (-0.32%)	⬇️

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