Add initial resources.md for discussion

The first draft of a Kubernetes resource model.
Again, we should be clear what this representation is.  It's not JSON syntax, so it's not clearly the primary REST API.  But it does describe a structure, albeit loosely.  Somewhere we should be more precise.

For the sake of clarity, given that I was arguing for the other representation, I presume that the case of named resources (assuming we wanted to do that at all) would look something like the following?

resources: [
  request: { cpu: 250, memory:  "40Mi", disk: [ { name: "hdc", size: "1G" }, { name: "hdx", size: "4G" }] }
]