Add reference to citation in docs page
@@ -8,6 +8,8 @@ This is the documentation for the Astroquery affiliated package of `astropy
Code and issue tracker are on `GitHub <https://github.com/astropy/astroquery>`_.
+If you use astroquery, please [cite](https://github.com/astropy/astroquery/blob/master/astroquery/CITATION) the [paper](https://ui.adsabs.harvard.edu/abs/2019AJ....157...98G/abstract).
+
Introduction
------------
