Add .gitignore file

Change-Id: Icb5f1fd8879a7a99af688d51fd02f8c30c9bdb14
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

.gitignore

+Makefile*
+*.pdb
+*.exe
+*.dll
+*.ilk
+*.obj
+*.lib
+*.res
+*.exp
+*.manifest
+*_resource.rc
+moc_*.cpp
+ui_*.h
+qrc_*.cpp
+*.moc
+.qmake.cache
+config.log
+tmp
+include
+src/multimedia/qtmultimediaversion.h
+src/multimediawidgets/qtmultimediawidgetsversion.h