Added readthedocs badges

README.md

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 `flatstar` is a pure-Python tool for drawing stellar disks with scientifically-accurate limb darkening. Each pixel has an accurate fractional intensity in relation to the total stellar intensity of `1.0`. It is ideal for ray-tracing simulations of stars and planetary transits.
 
 [![Build Status](https://travis-ci.com/ladsantos/flatstar.svg?branch=main)](https://travis-ci.com/ladsantos/flatstar) [![Coverage Status](https://coveralls.io/repos/github/ladsantos/flatstar/badge.svg?branch=main)](https://coveralls.io/github/ladsantos/flatstar?branch=main)
+[![Documentation Status](https://readthedocs.org/projects/flatstar/badge/?version=latest)](https://flatstar.readthedocs.io/en/latest/?badge=latest)
+
 
 ![flatstar](assets/flatstar.png)
 

docs/source/index.rst

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 .. image:: https://coveralls.io/repos/github/ladsantos/flatstar/badge.svg?branch=main
     :target: https://coveralls.io/github/ladsantos/flatstar?branch=main
     :alt: Coverage
+.. image:: https://readthedocs.org/projects/flatstar/badge/?version=latest
+    :target: https://flatstar.readthedocs.io/en/latest/?badge=latest
+    :alt: Documentation Status
 
 ``flatstar`` is an open-source Python tool for drawing stellar disks as
 ``numpy.ndarray`` objects with scientifically-rigorous limb darkening. Each