Better CMake Part 7 -- Package Configs for Header Only Libraries

[@edvardasvysniauskas7377]

Thanks for making this, really helped understanding how to use header only libraries in other projects.

[@graflaszlo]

Would be nice to see a multiconfig and multiplatform CMake video.

[@kcchaitu]

Thanks for the video. It's very useful. Your channel is one of the best ways to learn CMake.