A user receives emails for his tasks

[fynnfeldpausch]

As a user, I want to receive email notifications so that I don't forget my tasks.

Acceptance criteria

• the user receives email notifications about his tasks
• the email lists all tasks that are not done
• emails are sent every day

Optional acceptance criteria

• the user can configure the email interval
• the user can set a due date for tasks and only receives emails for due tasks

Additional information
We prefer quality over quantity. Clean code is a given. We expect all test to run.