Make a call using In-App voice via JS SDK.

[sutharmonil]

We need a good example which demonstrates how to make a call using the JS SDK and C# web api.
Also, since the existing Nexmo chsarp library does not support JWT generation directly we need a sample for the same. So far following the vue.js sample on the Nexmo blog did help. But it takes up a lot of time translating it all into a Microsoft stack.

[RabebOthmani]

Closing issue as it's been discussed elsewhere (StackOverflow and Community Slack)