Include documentation links for model list in readme

[darrylong]

Description

In this PR, readthedocs documentation links are added to the model list in readme.md.

Related Issues

Checklist:

• [ ] I have added tests.
• [ ] I have updated the documentation accordingly.
• [ ] I have updated README.md (if you are adding a new model).
• [ ] I have updated examples/README.md (if you are adding a new example).
• [ ] I have updated datasets/README.md (if you are adding a new dataset).

[tqtg]

LGTM