Update contributing docs

[FillZpp]

Signed-off-by: FillZpp FillZpp.pub@gmail.com

Ⅰ. Describe what this PR does

Update contributing docs

[codecov-commenter]

Codecov Report

Merging #870 (c559fa5) into master (797935c) will decrease coverage by 0.18%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #870      +/-   ##
==========================================
- Coverage   48.02%   47.84%   -0.19%     
==========================================
  Files         118      119       +1     
  Lines       11092    11235     +143     
==========================================
+ Hits         5327     5375      +48     
- Misses       4958     5042      +84     
- Partials      807      818      +11     

Flag	Coverage Δ
unittests	47.84% <0.00%> (-0.19%)	⬇️

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

Impacted Files	Coverage Δ
pkg/util/inplaceupdate/inplace_update_defaults.go	40.31% <0.00%> (ø)
pkg/controller/cloneset/cloneset_status.go	83.78% <0.00%> (-5.41%)	⬇️
pkg/controller/cloneset/cloneset_controller.go	50.59% <0.00%> (-2.38%)	⬇️
pkg/control/sidecarcontrol/util.go	49.03% <0.00%> (-0.31%)	⬇️
pkg/controller/sidecarset/sidecarset_processor.go	70.00% <0.00%> (-0.12%)	⬇️
pkg/controller/sidecarset/sidecarset_controller.go	13.88% <0.00%> (ø)
pkg/control/sidecarcontrol/history_control.go	0.00% <0.00%> (ø)
pkg/controller/uniteddeployment/revision.go	67.69% <0.00%> (+1.53%)	⬆️

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[furykerry]

/lgtm

[FillZpp]

/approve

[kruise-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FillZpp

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