Docker allows for an easy way to get a reproducible build environment,
add a docker file containing debos which can be used for image builds.

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Reviewed-by: Héctor Orón Martínez <hector.oron@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D7243

Add initial description of recipes in README.

Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>
Reviewed-by: Frédéric Dalleau <frederic.dalleau@collabora.co.uk>
Reviewed-by: Emanuele Aina <emanuele.aina@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D7205

Add configuration for arcanist, license file and short readme.

Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>

Differential Revision: https://phabricator.apertis.org/D7200