Add initial resources.md for discussion

The first draft of a Kubernetes resource model.
Nits as I made a quick last pass.  We can fix in a followup.

Still using E notation here.

Still some unclarity on float.  If I want 512MiB of memory, I can say "512Mi" or 631242752.  Am I also allowed to say "0.5Gi" ?  That is, are you intending to allow float for all fields, or just CPU?  You know my position on float at all, so the more limited my concession the happier I am.

You mention below milli-units but we don't actually say what precision floating point we use.  Specifically 0.0001 when scaled against Tera (e.g. for dis) is over a hundred MB.  If we're going to round that off, we should say so.  But I hope we can just say that FP only works for CPU.  Or not at all.