[Scenario]: Add a Credential Manager Sample

[simonkurtz-MSFT]

Describe the scenario

Define a sample to use Credential Manager .

Improvement to Project

Decoupled authentication and authorization between API caller and API provider are a strong aspect of using API Management to logically abstract and secure backend or 3rd party APIs.

Are you able to collaborate and/or submit a pull request?

Yes

[simonkurtz-MSFT]

@jukasper, could you help with defining a scenario, please?