GH-0 Add integration test as a test containers

[Volland]

So.

The test is a crucial part of any project. It better to have the test immediately on go.
I use an integration test. It is more preferable to use a contract testing like but as far as out API is just a
standard crud and we have no complex service relations Pact is overkill.

Why docker containers?

Yep it a bit harder to write and a bit tricky to run
Maybe https://github.com/One-com/node-mocha-docker-postgres could make life a bit easier.
Main benefit. We set up a real DB and real full tuned server with all middleware and no magic env variable toggle that change how a system behaves.
Only one - we need to tune connection and preferably to use separate DB with a different name

It is still in progress.
I have covered a creation of item the happy path.