Add Crystal support

[veelenga]

Hey everyone.

This PR adds support for Crystal programming language:

• https://crystal-lang.org/
• https://crystal-lang.org/docs/
• https://github.com/crystal-lang/crystal

Background

I started working on integrating Ameba static anaysis tool for Crystal to Codacy:

• https://github.com/veelenga/ameba
• https://github.com/veelenga/codacy-ameba

But noticed I can't run codacy-plugins-test because the language itself is not supported yet.

[andreaTP]

thanks a lot for your effort! Much appreciated also to verify our very own code :-) https://github.com/codacy/git-version we are going to work on it!

[veelenga]

Thanks for such a quick response and merge.

Could you please explain what should I do now to be able to use Crystal language in https://github.com/codacy/codacy-plugins-test ? Do you need to make a new release of codacy-analysis-core package first?

[andreaTP]

@veelenga we need to update some private repos, I'm on it. I'll ping you as soon as it's ready.