[libc-commits] [libc] [libc] Add 'Maintainers' file (PR #133297)

[Michael Jones via libc-commits]

michaelrj-google wrote:

> > ```
> > Yifan Zhu \
> > yifanzhu at rochester.edu (email), [Schrodinger ZHU Yifan](https://github.com/schrodingerzhu) (GitHub)
> > ```
> 
> We should just approve this and then you can add your details in a separate PR.

I like the idea of adding this file, but I'd prefer to either start with a completely empty file then add each person/group in individual PRs or start with a completed list. 

https://github.com/llvm/llvm-project/pull/133297