Implement support for Somfy doorkeeper

[josch31]

Hi,

it would be great to have the smart doorlock Somfy Doorkeeper implemented to the supported devices. Doorkeeper is connected with Tahoma, but normally it uses the Somfy Keys app. It would be good to lock/unlock the door and to see the status of the door (locked/unlocked, open/closed).

Thanks and have a nice day.

Best regards
Jochen