add setup metadata to help PyPI flesh out content on pypi package page (#22085)
Summary:
add setup metadata to help PyPI flesh out content on pypi package page.
Apparently this might help flesh out the "Used By" feature according to driazati
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22085
Differential Revision: D16604703
Pulled By: soumith
fbshipit-source-id: ddb4f7ba7c24fdf718260aed28cc7bc9afb46de9
