Add additional ways to contribute part to update zh doc#18762

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k8s-ci-robot merged 3 commits intokubernetes:masterfrom gaoguangze111:update-contribution-page-zh

Jan 24, 2020

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Commits on Jan 18, 2020

Add additional ways to contribute part to update zh doc
gaoguangze111
committed

Commits on Jan 21, 2020

Add original English text
gaoguangze111
committed

Commits on Jan 22, 2020

Update content/zh/docs/contribute/_index.md

gaoguangze111
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tanjunchen
authored