A resident can add an SMS phone number to their account

[wryenmeek]

GIVEN a resident has an account
AND they are logged in
WHEN a resident adds a phone number to their account
THEN a verification code is texted to their account

GIVEN a resident has received an SMS verification code
WHEN a resident confirms their SMS verification code
THEN SMS Alerts are made available to the Resident

Acceptance Criteria

1. Residents can validate their phone number and opt into SMS alerts
2. UI automation tests
3. Product documentation is updated in github
4. demo to product manager

[wryenmeek]

@dannychapman - is this worth mocking up?
@paulsmith @aub - does this need to be broken up?
@MissPaaj - do we need research considerations?

[aub]

@wryenmeek I think it's fine as-is.

[leannammiller]

dupe