create draft of Hyrax 5 Metadata Architecture (with Fedora 6+)

[morganem0]

Descriptive summary

create draft of Hyrax 5 Metadata Architecture (with Fedora 6+)

Dolsy is working on this - draft in progress: https://samvera.atlassian.net/wiki/spaces/hyraxdocs/pages/edit-v2/4134240263?draftShareId=1741498a-c3b9-4829-9c54-53e3d626e500

Acceptance Criteria/Expected Behavior

TBD

Rationale

This issue is for Hyrax V5 documentation, not a feature. The rationale for this documentation is:

• provide an "in-depth metadata guide that documents the RDF/PCDM representation of metadata in Hyrax 5, as implemented in Fedora 6 and using OCFL.
• Although this layer of description is invisible to the end users of a Hyrax application, and repository managers can largely ignore its details in their day-to-day interactions with the application. -- users who want to understand how a Hyrax repository stores and represents its resources may find this guide helpful, as well as those needing to troubleshoot a data store or prepare for a migration."
• The guide covers the Hyrax implementation of "the Portland Common Data Model (PCDM), which provides a scheme for organizing digital resources and their relationships."

Related work

TBD: Link to related issues or prior related work here.