This adds a README to the project so that the contribution process is
explicit as well as the licenses that apply to the source code.

Cc: Quentin Schulz <foss+kernel@0leil.net>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Link: https://lore.kernel.org/r/20220113094404.64510-1-quentin.schulz@theobroma-systems.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>