database setup

[Ralph Seichter]

* David Mehler:

> Error: near line 1: no such table: provider
> Error: near line 2: no such table: server
> [...]

As is usual for SQL databases, the structure needs to be created before
adding content. Section 4.2 of the documentation [1] shows how to do it
using 'curl'. Should you prefer to manually execute the necessary steps,
see the example SQL file [2] the required DDL statements.

[1] https://gitlab.com/automx/automx2/-/blob/master/doc/automx2.adoc
[2] https://gitlab.com/automx/automx2/-/blob/master/contrib/sqlite-sample.sql

-Ralph