could we add a CMakeLists.txt file to make it cowork with cmake or vcpkg?

[zhangfuwen]

Hi, could we add a CMakeLists.txt file so that this library can be included using cmake or even vcpkg?
I've written an example of CMakeLists.txt, but I am no export of cmake, so I am not making a pull request. This file can be found here for your reference. single header makes this library easy to use. But I think cmake or vcpkg will make it easier for people to include it into their projects.