Integrate Jest for testing

[begueradj]

What problem does this feature solve?

Suggest Integrates unit testing through Jest during the scaffolding process.
This template ignores totally software testing concepts as it does not suggest any tool to run unit tests, for example.

What does the proposed changes look like?

During the scaffolding process, Jest should be selectable to run unit tests.

_{This feature request is available on Nuxt community (#c106)}