adding details on how to citation the package and specific models

[karllark]

Closes #206
Closes #165

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.88%. Comparing base (604da6a) to head (2911e94).
Report is 79 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #212   +/-   ##
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  Coverage   99.88%   99.88%           
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  Files           8        8           
  Lines         902      902           
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  Hits          901      901           
  Misses          1        1           

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[mdecleir]

Just 2 small comments.
Otherwise, it looks great.
Thanks for this update!

[mdecleir]

One additional comment/question. What is the purpose of the reference API: https://dust-extinction.readthedocs.io/en/stable/dust_extinction/reference_api.html?

It looks like some of that page is broken.

[karllark]

One additional comment/question. What is the purpose of the reference API: https://dust-extinction.readthedocs.io/en/stable/dust_extinction/reference_api.html?

It looks like some of that page is broken.

This page provides the programming interface info. There are supposed to be graphical flow diagrams. Graphviz is clearly not working. Will have to investigate. Not part of this PR. Will open an issue.