README: Provide an example hook script

Provide a simple hook script that just looks at the X-Aiaiai-Project
header that could be added, with e.g:

git format-patch --add-header="X-Aiaiai-Project: foo" while formatting
patches.

This is enough to avoid per-project email addresses.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
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