added the doc 'development-workflow.md'

[elitecodegroovy]

What problem does this PR solve?

The document can help contributor how to do development workflow.

What is changed and how it works?

I just added a document and update the document CONTRIBUTING.md.

[sre-bot]

Hi contributor, thanks for your PR.

This patch needs to be approved by someone of admins. They should reply with "/ok-to-test" to accept this PR for running test automatically.

[sre-bot]

Hi contributor, thanks for your PR.

This patch needs to be approved by someone of admins. They should reply with "/ok-to-test" to accept this PR for running test automatically.

[elitecodegroovy]

What problem does this PR solve?

The document can help contributor how to do development workflow.

What is changed and how it works?

I just added a document and update the document CONTRIBUTING.md.

In order to solve the issue that the Contributor License Agreement is not signed by superadmin account, I open the new PR. So please close the up PR *:added the doc 'development-workflow.md'

[codecov-io]

Codecov Report

Merging #1464 into master will decrease coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1464      +/-   ##
==========================================
- Coverage    67.8%   67.63%   -0.17%     
==========================================
  Files         158      158              
  Lines       15262    15262              
==========================================
- Hits        10348    10323      -25     
- Misses       4003     4019      +16     
- Partials      911      920       +9

Impacted Files	Coverage Δ
server/leader.go	82.35% <0%> (-5.89%)	⬇️
server/util.go	72.97% <0%> (-4.73%)	⬇️
server/etcd_kv.go	70.9% <0%> (-3.64%)	⬇️
server/core/kv.go	76.47% <0%> (-1.48%)	⬇️
server/option.go	90.41% <0%> (-0.84%)	⬇️
server/grpc_service.go	53.66% <0%> (-0.48%)	⬇️
client/client.go	68.53% <0%> (-0.24%)	⬇️
server/cluster.go	78.81% <0%> (+0.56%)	⬆️
server/api/redirector.go	84.21% <0%> (+5.26%)	⬆️

---

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[nolouch]

Thanks, LGTM

[rleungx]

Thanks for your PR! And I leave some comments here.

[rleungx]

The rest LGTM.

[nolouch]

/rebuild

[rleungx]

@elitecodegroovy Thanks. Merged