FindQSkinny.cmake is missing

[uwerat]

A FindQSkinny.cmake file for applications using qskinny is missing

[Alexander Kavon]

Looking into this here:

https://izzys.casa/2020/12/how-to-find-packages-with-cmake-the-basics/
https://cmake.org/cmake/help/latest/manual/cmake-developer.7.html#find-modules
https://cmake.org/cmake/help/latest/manual/cmake-packages.7.html#config-file-packages

I have a basic file created, but need to test it out before submitting a patch.

[Alexander Kavon]

resolved in #351