README: introduce libweston

What is libweston and where do we intend to go with it.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
Acked-by: Giulio Camuffo <giuliocamuffo@gmail.com>
Acked-by: Daniel Stone <daniels@collabora.com>
Acked-by: Jon A. Cruz <jonc@osg.samsung.com>
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