Configure snippet extractor

[ErikSchierboom]

While not a hard requirement, a nice improvement might be to customize the snippet extractor to skip over comments and other irrelevant part of the code (if any).

See https://exercism.org/docs/building/tooling/snippet-extractor and https://github.com/exercism/snippet-extractor/#add-your-language.

[loziniak]

I have some problems with that:
exercism/snippet-extractor#62