doc: Create directory structure for docs migration
The spec  recommends the following sections:
Only a few of these are useful here:
Add these and populate them.
normalize constants to align with resource classes
Changes the lowercased constants to uppercase and replaces the : with a
_ character. This aligns with the naming convention for resource classes
in the placement API.
Adds the basics of the new os-capabilities library, including a README
and a couple helper functions that allow the user to list both symbol
names as well as the capability strings themselves.
Added x86 CPU instruction set extensions as an initial set of namespaced
standardized capability strings.