README: fill in a rough draft of the design description
README: fill in a rough draft of the design description

Perhaps the README isn't the best place, but we can always move it
later.

Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>

udeved/cgmanager,lxc/cgmanager,lxc/cgmanager,hustcat/cgmanager,hustcat/cgmanager,hallyn/cgmanager-pkg-ubuntu,hallyn/cgmanager,udeved/cgmanager,hallyn/cgmanager,hallyn/cgmanager-pkg-ubuntu