Add CITATION.cff that contains the main contributors (#490)
Summary:
Add a citation file to torchbench
Pull Request resolved: https://github.com/pytorch/benchmark/pull/490
Reviewed By: xuzhao9
Differential Revision: D31432576
Pulled By: erichan1
fbshipit-source-id: 913c4b3cdaa18b15606572fa589aa2a8a5c38a3d
