Add item about wiki page improvement
Add item about wiki page improvement

The wiki page will be the window for Senlin to tell its story. Need to
start working on it.

Change-Id: Ib846a196c07390ee5dfc3c6f29a1306cf8627170

openstack/senlin,Alzon/senlin,openstack/senlin,Alzon/senlin,tengqm/senlin-container,stackforge/senlin,stackforge/senlin,openstack/senlin,tengqm/senlin-container