Added some information about Qt Creator IDE integration to the wiki

[Hossein Noorikhah]

Hi,

I have added some information about how to use Qt Creator for
building, running and debugging LibreOffice in the appropriate section
of the wiki:
https://wiki.documentfoundation.org/Development/IDE#Qt_Creator

I think other sections related to other IDEs also need to be revised
and improved, because not everything works out of the box in the IDEs.

Regards,
Hossein