Add the StorageView example

The StorageView example demonstrates the QStorageInfo API.

Change-Id: Ifaabadbe64fdf26d13a4ce4690e6b54514667c9f
Reviewed-by: Ivan Komissarov <ABBAPOH@gmail.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>