Implement a rest endpoint /register that receives a POST request from the diaper app

[davidsth]

This deals with registering a partner (user) through the diaper app. The process of registration happens when the diaper app sends a POST request to the /register endpoint as described below.

When The app receive a registration request on the /api/v1/register route
Then the system will create a new partner
And the system will email the partner with the registration link

The /register POST request includes the following payload:

{
organization_id: string,
partner_id: string,
email: string
}

Tests should be included that makes sure the registration link is sent. Docs on how to add rspec tests for action mailer is found here

1. https://relishapp.com/rspec/rspec-rails/docs/mailer-specs
2. https://www.lucascaton.com.br/2010/10/25/how-to-test-mailers-in-rails-with-rspec/

[denys-medynskyi]

Can I take this?