Add husky to execute prettiere / eslint on commit / push

[dawehner]

It would be nice as a contributor to not have to remember executing eslint/prettier locally or wait for the tests to pass on github.

Idea

1. Run prettier on commit
2. Run eslint and tests (unit tests) on push

This way you can not create a PR, unless you fix those problems.
You can always bypass this using --no-verify on commits and PRs