Access control documentation: Example roles introduced

This section of the access control manual covers typical roles.
We begin with a short introduction and the contributor role in this
change.

Change-Id: Ie7fbadd8f889e9d8ba5d8b8f485a26a7f7f2f680
Signed-off-by: Fredrik Luthander <fredrik.luthander@sonyericsson.com>
Signed-off-by: Fredrik Luthander <fredrik.luthander@sonymobile.com>
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