sms validation flow

[edzillion]

This is related to https://github.com/CirclesUBI/circles-api/issues/6

There are some questions about the flow that are still unclear:

• For the pilot we will be signing people on manually, so the flow would be introduction -> operator gets personal details & phone number -> operator enters that into AWS -> user receives code at their email and a login link
• So in this case the SMS validation happens before login.
• Copying the user flow as outlined in the wireframes (which is better thought out) may not be as easy as above.

[edzillion]

https://docs.aws.amazon.com/cognito/latest/developerguide/how-to-create-user-accounts.html

[edzillion]

I have implemented this on the cognito-auth branch. Instead we are allowing users to create accounts.