CMake export configuration missing #250
Description
The CMakeLists.txt is missing an export configuration. This makes it hard to add this dependency to a CMake project when it's fetched from different sources per platform.
https://cmake.org/cmake/help/latest/guide/tutorial/Adding%20Export%20Configuration.html
It'd be nice to apply the patch from the Vcpkg port to this repo. Updating it as necessary.
https://github.com/microsoft/vcpkg/blob/master/ports/utf8proc/export-cmake-targets.patch