Create code snippets for api

[kacper-cyra]

While coding next slice I came to conclusion that most of the typing could be done with code snippets/templates, and that could save us some time. What do you think @nowakprojects @KonradSzwarc ?

[github-actions]

Branch issue-342-Create_code_snippets_for_api created!

[MateuszNaKodach]

Very nice idea @kacper-cyra !
It would be nice to make it IDE independent.
So, maybe NestJS schematics is a way to go :) ?

nestjs/nest-cli#630
https://docs.nestjs.com/cli/usages

Samples:
https://github.com/nestjsplus/dyn-schematics