CircleCI config for Windows (#524)
CircleCI config for Windows (#524)

Summary:
Add a config that runs the MSYS2-based Windows build.

Pull Request resolved: https://github.com/facebook/redex/pull/524

Reviewed By: int3

Differential Revision: D22960996

fbshipit-source-id: f8864093211b6473591389f19b8827f89795b948

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex