Please add documentation to the master branch. Thank you!

There is a placeholder here:

https://docs.automotivelinux.org/en/master/#5_Component_Documentation/4_drm-leasemanager/

Git sources are here:

git clone https://git.automotivelinux.org/AGL/documentation

1. Edit  docs/5_Component_Documentation/4_drm-leasemanager.md
2. git add
3. git commit -s -m"...................."
4. git review -s
5. git review