Update index.rst

Author: aaronkw

docs/index.rst

@@ -42,3 +42,8 @@ Help topics
 Who are we?
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 HumanBase is actively developed by the `Genomics group <https://www.simonsfoundation.org/flatiron-institute/simons-center-for-data-analysis/genomics/>`_ at the  `Flatiron Institute <https://www.simonsfoundation.org/flatiron-institute/>`_ .
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+Licensing
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+All data and predicitons in HumanBase are freely available under a `CC-BY 4.0 <https://creativecommons.org/licenses/by/4.0/>`_ license. Please give appropriate credit, provide a link to the license, and indicate if changes were made.