Issue 1698 add examples for az repos import create command

[RakeshMohanMSFT]

Fixes https://github.com/Azure/azure-cli-extensions/issues/1698

Please make sure the code is following contribution guidelines in CONTRIBUTING.md

• [ ] : This PR has a corresponding issue open in the Repository.
• [ ] : Approach is signed off on the issue.

[V-hmusukula]

/azp run

[azure-pipelines[bot]]

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