License / terms for models in model collections

[dsheldon]

We should:

1. Add a license and/or terms of use for models in our public-facing model collections. We should check with the S&T team about what license we can use. If there are no restrictions I would suggest CC-BY.
2. Make sure the collection index includes attributions and disclaimers as described in S&T terms of use: https://science.ebird.org/en/status-and-trends/products-access-terms-of-use. (I know we link to S&T prominently already, I'm suggesting adding their exact text for citation and disclaimers.)