Support for Zig language

[RpxdYTX]

Please consider making a Pull Request if you are capable of doing so.

Additional context I can't know every programming language in the world, so it would be appreciated if you write here at least possible file extensions of the language, or you can add any additional context (would be cool if you attach some files for testing syntax highlighting)

File Extensions: .zig and .zon (Zig Object Notation)