[libcxx-commits] [libcxx] [libc++] Add a design document for Windows support (PR #202668)

[A. Jiang via libcxx-commits]

https://github.com/frederick-vs-ja approved this pull request.

I dropped the motivation part from the PR description because I believe the existence of this documentation is already implying similar motivations.

The CI failures were unrelated.

https://github.com/llvm/llvm-project/pull/202668