It is recommended to add support for automatic mount and umount

[oucaijun]

When one or more mtp devices attached, a backend (or udev?) automatically mount the device, and use udisk2 to monitor the volume-added/mount-added event. When mtp device deattached, the backend (or udev?) automatically unmount the device, and use udisk2 to monitor the volume-removed/mount-removed event.

It's useful as we prefer to provide a easy way to manage mtp device, it's not easy for normal user who lacks of understanding of Linux. That's what I really want to achieve.

Will it be a time-taking work?