Add a little more description for what belongs in meta-arm/meta-arm (per
feedback from Richard Purdie), and modify the max width to be 80
characters to improve readability.

Change-Id: I8f7b0598e3336132c2594c92cf3400dd5e216baf
Signed-off-by: Jon Mason <jon.mason@arm.com>

Filipe Rinaldi authored Oct 08, 2019 and Jon Mason committed Nov 15, 2019

Signed-off-by: Filipe Rinaldi <filipe.rinaldi@arm.com>

Add README and License Files in the root directory describing the layers
and process for interacting with the meta-arm layer.  Create the
directories for future layers (and add empty README files to force the
directories to be created by git).

Change-Id: I4d70759bf90b1c964e6d9040d145737b2f441205
Signed-off-by: Jon Mason <jon.mason@arm.com>