Update README.md to add link to KEP

[circy9]

Update README.md to add link to the corresponding KEP.

[linux-foundation-easycla]

• ✅login: circy9 / (04e70e5)

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: circy9, ryanzhang-oss

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[ryanzhang-oss]

/lgtm