Develop a CRO Contribution Data Model

[mbrush]

It was recently proposed that we develop a data model specification based on the CRO to support clear and concise representation of contributions made by agents to research artifacts. I am starting this ticket to initiate this work (although it will likely end up in its own repo?).

I created two documents to get things started:

1. A Project Plan that outlines deliverables required to meet short term project requirements.
2. An Information Model Proposal that presents a candidate model, compares it to related efforts, and provides an exemplar dataset demonstrating the model's application to an example contribution scenario.

@mellybelly @marijane @nicolevasilevsky @kristiholmes @LisaOKeefe1 please review these documents, edit/comment as desired, and we can follow up with a call as needed.