Update README.md

[robisoh88]

Is this a bug fix or adding new feature?
No
What is this PR about? / Why do we need it?
Volume Snapshots README.md is missing steps to install Volume Snapshot beta CRDs (volumesnapshotclass, volumesnapshotcontents, volumesnapshots). Following the Volume Snapshot example alone does not work. Need to update the document. See below for more info.
What testing is done?

Following the guide without having CRDs EBS CSI Driver fails with "VolumeSnapshotClass not in "snapshot.storage.k8s.io/v1beta1""(see issue). Moreover the EBS CSI Driver with Alpha features is the correct driver that need to be installed. Installing the stable version of the ebs csi driver will not include external snapshotter sidecar, snapshot controller or service account/RBAC. Pull request is to mention this in the Volume Snapshot example README.

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[robisoh88]

/assign @jsafrane

[coveralls]

Pull Request Test Coverage Report for Build 1307

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 81.253%

---

Totals
Change from base Build 1281:	0.0%
Covered Lines:	1595
Relevant Lines:	1963

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💛 - Coveralls

[robisoh88]

I signed it

[ayberk]

I think it'd be more useful to link directly to installation part of their README: https://github.com/kubernetes-csi/external-snapshotter#usage

[robisoh88]

Thanks @ayberk , I agree on this especially should any further changes be made on where their files are stored in the future it would be better to link directly to their README. Please see the new commit.

[ayberk]

/ok-to-test
/lgtm
/approve

Thank you!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ayberk, robisoh88

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