Add CMake support

[GeorgH93]

Hello, I really like your little UUID lib. Since I use CMake, I took the liberty to create a CMake build configuration for the project.

The CMake setup:

• Builds a static library
• Generates proper installation targets
• Creates CMake config files for easy integration in other CMake projects
• Maintains the existing directory structure
• Generates the version header

I haven't tested it on all the platforms that are supported by the project, only Linux, Windows and MacOS.

[boris-kolpackov]

Thanks for the PR, however, I am going to reject it, sorry.

I have a principled commitment to never touch CMake myself and I've been burned too many times by people contributing an alternative build system support or CI integration to one of my projects, then disappearing and leaving me to maintain it.

If you would like, you are welcome to fork this project and maintain CMake support there. I can then add a link to your fork to the project's README suggesting that people look for CMake support in your fork.