Add licensing information to resources section of model website

[cpritcha]

Licensing mentioned in https://forum.comses.net/t/archiving-your-model-4-adding-metadata-to-your-model/7380 but should also be accessible in the resources tab.

Possible Solution: add a page on discourse with licensing information and link it in the resources section and in the model archiving tutorial.

[cmbarton]

Here is a nice source for licensing info https://www.whitesourcesoftware.com/resources/blog/open-source-licenses-explained/