[libc-commits] [libc] [libc] Add maintainers file (PR #133471)

[Tristan Ross via libc-commits]

https://github.com/RossComputerGuy commented:

Probably add me for UEFI?

```rst
| Tristan Ross
| tristan.ross\@midstall.com (email), `RossComputerGuy <https://github.com/RossComputerGuy>`_ (github)
```

https://github.com/llvm/llvm-project/pull/133471