Add Volume Snapshot Support Proposal

[xing-yang]

This document proposes to add Kubernetes snapshot support
in-tree.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: xing-yang
We suggest the following additional approver: saad-ali

Assign the PR to them by writing /assign @saad-ali in a comment when ready.

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• contributors/design-proposals/storage/OWNERS

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[k8s-ci-robot]

Hi @xing-yang. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[xing-yang]

Looks like I need to get the CLA issue resolved first. There may be an email address mismatch.

[xing-yang]

Will try to re-submit to resolve the cla issue.