Add base Jest configs to generated project

[eklemen]

Is your feature request related to a problem? Please describe.
No

Describe the solution you'd like
A generated project should include the configs for a testing framework, and at least one test for the generated endpoint

Describe alternatives you've considered
Testing it in prod

Additional context
Add any other context or screenshots about the feature request here.

[eklemen]

This will be a stepwise approach. Starting with mongoose or sequelize and getting at least one out instead of waiting to finish both.

[eklemen]

#48 adds tests for Javascript - mongoose