Is there an existing issue for this?

• I have searched the existing issues

What is the missing lexer?

I would like support for Beef Github.
The language syntax itself is relativly similar to c# to the point where the current language highlighting for Github just uses the C# one which would also be fine here imo.

The main reason I want support is because the file ending overlaps with brainfuck and as such Beef files often end up with no syntax highlighting at all see:
https://code.booklordofthe.dev/Booklordofthedings/Bofa/src/branch/main/src/BofaParser.bf

I could probably implement support for Beef myself if necessary.

Links to existing syntax definitions

https://github.com/github-linguist/linguist/tree/master/vendor
Its in the list and just using the default C# highlighting