Adding an example file for creating VM with differencing os disk using DiffDiskSettings Property

[hari-bodicherla]

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[hari-bodicherla]

@jhendrixMSFT , could you please review these changes. These are additional simple changes on the top of main PR : #3944 . thanks

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[azuresdkci]

Can one of the admins verify this patch?

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Encountered a Subprocess error: (azure-sdk-for-go)

Command: dep ensure
Finished with return code 1
and output:

The following issues were found in Gopkg.toml:

  ✗ unable to deduce repository and source type for "golang.org/x/crypto": unable to read metadata: go-import metadata not found

ProjectRoot name validation failed