add empty qml demo

Yuhang Zhao

2023-12-11 e9ce49b601b412050e9709a3474e51950dccd5a9

 src/core/CMakeLists.txt

@@ -6,10 +6,12 @@
set(_src
    qwkcoreglobal.h
    qwkcoreglobal_p.h
    qwkcoreglobal.cpp
    corewindowagent.h
    corewindowagent_p.h
    corewindowagent.cpp
    windowitemdelegate.h
    windowitemdelegate.cpp
    contexts/abstractwindowcontext_p.h
    contexts/abstractwindowcontext.cpp
)