docs(product): stub Product model

[gregswindle]

Feature Request

1. User story

As a customer relationship manager,
I must track products
In order to provide value to consumers.

2. Acceptance criteria

We'll be done when:

• 1. Criterion one exhibits behavior A.
• 2. Criterion two exhibits behavior B.
• 3. Criterion three exhibits behavior C.

3. Notes

⌦ Provide additional information here, if you need to.