Add support to all k8s versions for VolumeSnapshot

[Kartik494]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
Have added a new file csi-snapshot-v1beta1.yaml which creates VolumeSnapshot object (for apiversion v1beta1) which can be applied for k8s version >=v1.17

Which issue(s) this PR fixes:

Fixes #159

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @Kartik494. Thanks for your PR.

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[jsafrane]

/ok-to-test
/lgtm
/approve

[jsafrane]

/release-note-none

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jsafrane, Kartik494

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