Charm composition docs

[Jorge O. Castro]

Hi! I've had people ask me where they can get the docs for using charm
composition. They are not yet stable which is why it's not so obvious
so I thought I'd send a reminder to the list:

https://jujucharms.com/docs/devel/authors-charm-composing

Going forward this will be the recommended way to charm, so if you
have strong opinions on this page please let us know!

-- 
Jorge Castro
Canonical Ltd.
http://juju.ubuntu.com/ - Automate your Cloud Infrastructure