Add Lox language to showcase

[msujew]

The Langium Lox example is a fairly complex sample language that shows a few advanced language features, such as expressions, member calls, functions (with inner functions as well).

[emilkrebs]

Maybe build a web-interpreter?

[msujew]

Sounds good, the project already contains an interpreter. It might need to be extended/modified though.

[emilkrebs]

I made some changes to the lox language server, but I don't have permission to publish the branch.

[msujew]

@emilkrebs You could always fork the repo :)

I gave you write access to the project though.

[emilkrebs]

Yeah, will do that next time! Thank you!