Add Car Configurator to the examples of the Qt DS

Car Configurator, which is used in the Qt Creator examples should be also present in the Qt DS. 

Car Configurator original project is found from:

https://git.qt.io/qt-demo-team/car-configurator

What needs to be done are

1) steps defined in the example integration: https://intranet.qt.io/display/QTPO/Adding+examples+to+Qt+Design+Studio

2) add the text of the Creator description page to the flipcard of the Qt DS

3) check the documentation for areas to improve: https://bugreports.qt.io/browse/QDS-15204