Add initial resources.md for discussion

The first draft of a Kubernetes resource model.
A note on unbounded.  Things like memory are very tricky here.  If you do not specify memory bounds, then the kernel does not always try to reclaim from you, which means you end up in this weird bi-modal behavior. 

When you apply a limit the kernel actively tries to keep you alive by reclaiming.  When you take off the limit, the kernel will happily use as much memory as it can for caches.  If there is a sudden spike on the machine, the kernel tries to reclaim, but only to a limit.  Those jobs without limits are the ones worst hit.

We need to continue beating on the kernel to behave better.