Support Crystal format

[zw963]

https://crystal-lang.org/

In fact, we almost done it, because it same as Ruby format, so we just need change the mask into:

*.rb;*.cr;Gemfile;Rakefile

And, change name from "Ruby Files" into "Ruby,Crystal Files" is enough.

Thanks

[Aaron]

If you'd like to post your Ruby or Crystal format to share with other users, or email it to us at [email protected] with a link back to this forum thread, we'd be glad to look it over.