Add initial pass at CHANGELOG section of README

api/scpca_portal/templates/readme.md

@@ -32,6 +32,10 @@ See the [Downloadable files](https://scpca.readthedocs.io/en/stable/download_fil
 
 For instructions on using the RDS files, please see [FAQ: How do I use the provided files in R?](https://scpca.readthedocs.io/en/stable/faq.html#how-do-i-use-the-provided-rds-files-in-r) or [FAQ: What if I want to use Python instead of R?](https://scpca.readthedocs.io/en/stable/faq.html#what-if-i-want-to-use-python-instead-of-r)
 
+## CHANGELOG
+
+A summary of changes impacting downloads from the ScPCA Portal is available in [the CHANGELOG section of our documentation](https://scpca.readthedocs.io/en/stable/CHANGELOG.html).
+
 ## Contact
 
 If you identify issues with this download, please [file an issue on GitHub.](https://github.com/AlexsLemonade/scpca-portal/issues/new) If you would prefer to report issues via e-mail, please contact us at [[email protected]](mailto:[email protected]).