Modify README With Instantiated Model Information

[AFg6K7h4fhy2]

PR for

There are PyRenew models that now exist in external repositories and, while referenced in Issues and PRs, it also makes sense to clearly indicate where these models exist. The author's expectation is that some people might go to this repository first, when looking for any of the PyRenew-dependent repositories, and not readily be able to find these external PyRenew models.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.53%. Comparing base (fd9e49e) to head (2a1c131).
Report is 1 commits behind head on main.

Additional details and impacted files

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[damonbayer]

Thanks @AFg6K7h4fhy2! Let me know what you think of my suggestion.

[dylanhmorris]

Related to @damonbayer's comment. I'm not sure it makes sense to call flulight "an Epidemia model"; could go with "previously implemented in Epidemia"?