Improve the Twilio example with test credentials

[YasharF]

Refresh the twilio example to more of a demo using test credentials: https://www.twilio.com/docs/iam/test-credentials

[promiseer]

Hey @YasharF
i have updated Test creds for Twilio

here is the PR #1258

[mdkaifansari04]

Hey is the issue is still in pending can I work on that

[promiseer]

yup you can

[promiseer]

Hi @YasharF
i've updated demo creds #1277

[YasharF]

@promiseer please do not resubmit any test credentials. This issue is about reworking an example to demonstrate Twilio's APIs. It is not for adding or replacing credentials.

[YasharF]

To add more to this, prior to considering any PRs, I would like to see a proposal and a discussion about the example and the implementation. I have looked at this issue myself and have not decided on a good implementation yet.