* TODO SQLite database support

Let's add database support using sqlite-simple . On startup we should
create a SQLite database if none exists. Right now we have no tables,
but we'll add one in the next task.

* TODO User signup and login
User signup should be basic sign-up. Ask the user their full name,
email and password. We'll send them a verification email to confirm
their email address and at that point ask for their password. We
should use standard encryption approaches for storing their hashed
password with the https://hackage.haskell.org/package/password
library.

We should support allowing users to log in and show them a basic
welcome page with "Welcome <full name> - <household>" and nothing else once they
sign in.

Otherwise, logged out users should be shown a sign-in form with a link to a separate sign-up form.

Logged in users should see a log out button, too.

We should create a rudimentary session infrastructure. Ensure we use http-only cookies for our session token.

** Households
When a user signs up, as part of sign-up we should ask them for the
name of their Household. All users will belong a single Household and
a Household may have more than one user.

The Household will ultimately be where tasks/chores are stored.
* TODO User invite
An existing user should be able to invite a new user by email to their household.

When the invited user signs up we should not ask them for a Household name but instead make them a member of the Household they were invited to.
* TODO Basic chores 

We should create a new table to store chores in the database. Each chore belongs to a household, has a name and an optional assigned-to user.

We should allow users to create a new chore and view their existing chores.

When creating a chore we should ask users for the chore name and an optional user to assign to that chore.

* TODO Chore schedules

TBD