RESOURCE-514 create the required files of the azure snapshot resource

[soumyo13]

Signed-off-by: Soumyodeep Karmakar soumyo.k13@gmail.com

Description

1. It contains all the singular and plural docs.
2. It contains the missing tf
3. added the integration test.

Issues Resolved

NA

Check List

Please fill a box or appropriate ([x]) or mark N/A.

• [x] New functionality includes integration tests/controls
• [x] New Terraform resources
• [x] Documentation provided or updated for resources
• [x] All Integration Tests pass
• [ ] All Unit Tests pass
• [x] rake lint passes
• [x] All commits have been signed off for the Developer Certificate of Origin. See https://github.com/chef/chef/blob/master/CONTRIBUTING.md#developer-certification-of-origin-dco

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