HexDocs is a place for Hex packages to host their documentation.
To find documentation sets on HexDocs, you can go to the following URLs:
http://hexdocs.pm/<package>/ - Latest documentation set for
http://hexdocs.pm/<package>/<version> - Documentation set for
You can also find documentation sets in the release section of package pages on Hex.pm
Documentation is automatically published when you publish your package, you can find more information here.
Learn how to write documentation here.