DOC: Expanded landing page documentation (#228)

skypyproject · Jun 22, 2021 · 15e1ded · 15e1ded
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 SkyPy Documentation
 ###################
 
-This package contains methods for modelling the Universe, galaxies and the Milky Way. Also included are methods for generating observed data.
-
+This package contains methods for modelling the Universe, galaxies and the
+Milky Way. SkyPy simulates populations of astronomical objects, generating
+random realisations of intrinsic and observed properties, with the
+intention the simulations can then be compared to data as part of an inference
+pipeline.
+
+.. Important:: If you use SkyPy for work presented in a publication or talk
+   please help the project via proper `citation or acknowledgement
+   <https://github.com/skypyproject/skypy/blob/main/CITATION.rst>`_.
 
 .. _getting-started: