Add cmake instructions

[Pajn]

This is a great module. However for a newbie in c++ and QML I can't get it to work together with CMake. I have got it to compile but QML doesn't find the import at runtime.

Providing instructions for CMake would help me very much.

[benlau]

I never use CMake to build Qt project. So I don't know what is the right way to do so. But I think it should just add all *.h , *.cpp from this project to your CMakeList.txt like your own source files?

[TanNgocDo]

@Pajn You should create QuickFlux as a Qml Plugin for easy resuing. For each application you can load QuickFlux plugin. The guideline is here : http://doc.qt.io/qt-5/qtqml-modules-cppplugins.html
Using Cmake is not so diffucult :)