…Update README.md to note external-snapshotter is required

[lectrician1]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design

/kind documentation

/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

Updates README.md to note external-snapshotter is required along with explaining how the snapshots are created. This fixes the issue I was having of snapshots not being created even though I followed the volumesnapshot example.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

none

[linux-foundation-easycla]

• ✅login: lectrician1 / (c077801)

The committers listed above are authorized under a signed CLA.

[k8s-ci-robot]

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[k8s-ci-robot]

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[andyzhangx]

/lgtm
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, lectrician1

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[coveralls]

Pull Request Test Coverage Report for Build 10692077366

Details

• 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 78.12%

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Totals
Change from base Build 10683635214:	0.0%
Covered Lines:	914
Relevant Lines:	1170

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💛 - Coveralls