Email service

[BrunoRosendo]

We should implement a service capable of sending emails from an account specified in the application's startup (e.g. [email protected] in production). That can be Gmail credentials specified in application.properties, you can check auth and file storage to see how custom properties can be used.

The service should be able to send arbitrary emails following a template, you can check the current website and NIJobs for inspiration. For example, there could be a template for an email template to recover a password, a template to announce to a recruit they've become a member, and many more use cases.