Add vcpkg support

Really nice library, it would be even greater if its possible to easily install it via vcpkg

Thank you ! I never used vcpkg but I found this : https://developerpaul123.github.io/c++/cmake/using-vcpkg-on-windows/ Paragraph "Using Packages Installed with vcpkg" shows how to use CMake-GUI with vcpkg. You can give it a try. If it doesn't work, project's CMake scripts need to be fixed.