xuemingdi

Add Supplemental Developer Contribution Guidelines

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* **Please check if the PR fulfills these requirements** - [x] The commit message follows our guidelines - [ ] Tests for the changes have been added (for bug fixes...

keadm installation document chinese version

1

* **Please check if the PR fulfills these requirements** - [X] The commit message follows our guidelines - [ ] Tests for the changes have been added (for bug fixes...