[WIP] docs: Update docker instructions

[rzr]

Change-Id: Id8be9fb4953722f0f0fbbafd6a970e6109d7913e Signed-off-by: Philippe Coval [email protected]

[rzr]

Relate-to: https://github.com/Samsung/Castanets/pull/44

[Tarnyko]

Hi, I had to use this additional command to run it on my setup :

$ xhost local:root

(this allows the container's root user to connect to the forwarded X11 socket)

If you add it to your PR, I'll happily +1 it.

[Chikdolman]

Can you rebase and update the doc?

[rzr]

yes I'll do this, I need to solve other priorities for now but next week should be ok