example: add launch application example

fix some bug while testing the example

Signed-off-by: ComixHe <heyuming@deepin.org>
Signed-off-by: black-desk <me@black-desk.cn>

examples/launchApp/CMakeLists.txt

@@ -0,0 +1,8 @@
+set(LAUNCHAPP_BIN launchApp)
+
+add_executable(${LAUNCHAPP_BIN} main.cpp)
+
+target_link_libraries(${LAUNCHAPP_BIN} PRIVATE
+    Qt${QT_VERSION_MAJOR}::Core
+    Qt${QT_VERSION_MAJOR}::DBus
+)