CMake documentation (mostly) available

From: Peter Dimov (pdimov_at_[hidden])
Date: 2023-01-07 02:32:51

I've written a document that explains how to use CMake to build
or consume Boost, at

https://github.com/boostorg/cmake/blob/develop/README.md

This targets users of Boost. Developer-centric documentation is also
available at

https://github.com/boostorg/cmake/blob/develop/developer.md

This is still unfinished, but I decided to "publish" it because the portions
that are present are still (hopefully) valuable.