[Question] RecoveryServices Vaults

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## This issue is a: (mark with an `x`)

- [ ] bug report
- [X] request for new sample
- [X] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

## Steps to reproduce:

No apply

## Errors and log messages:

No apply

## Expected behavior:

Some example or documentation using azure-sdk-for-go for [vaults](https://docs.microsoft.com/en-us/rest/api/recoveryservices/vaults)

## OS and Go versions:

Windows 10
Go 1.15
Go mod enabled

## Further info:

No apply

Review the repository's existing Go examples and the linked Recovery Services Vaults REST API documentation, using the stated Go 1.15 and Go modules context. Done means providing a useful azure-sdk-for-go sample or documentation for vaults; the issue does not name a specific file or test to run.

Written by the indexing model from the issue text.