Add support to Mooncake

[xingzhougmu]

I add Radio buttons to let users to choose if they are working with
Global Azure or Mooncake. By default the Global Azure option is checked.

And the Add AzureEnvironment varible to differentiate it. This variable
will be used when creating service client since the service endpoints
are different from Global Azure and Mooncake.

[msftclas]

Hi @xingzhougmu, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!

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[xingzhougmu]

Hi @msftclas,

I have followed the instructions you sent to me and completed CLA.

Thanks,
Xing

[huxuan]

Hi @xingzhougmu, thanks for your interests and contribution.

As this is just a demo of Cognitive Service Face API, I am not sure whether it is necessary to support different Azure regions as we may have more instances in different places (like Europe) in the future. This will cost more extra efforts for maintenance.

And for your pull request, I don't think it actually calls the Azure China instance. Seems there are two AzureEnvironment properties added. Are you sure this pull request is ready for review?

[xingzhougmu]

Hi @huxuan ,

Yes, currently I only added two environments "Global Azure" and "Mooncake".

And I will use the environment to set different service endpoint in this project.

Cheers,
Xing