python-click: new package

Signed-off-by: Mauro Condarelli <mc5686@mclink.it>
Reviewed-by: Yegor Yefremov <yegorslists@googlemail.com>

[Thomas:
 - rewrap Config.in help text, lines were slightly too long
 - remove excessive empty line at end of Config.in
 - specify BSD-3c as the license, since BSD is not specific enough.]

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>