Summary:
This diff creates the Android OSS build system for the module react/config
As part of this diff I also moved the module to react/config folder
changelog: [internal] internal
Reviewed By: JoshuaGross
Differential Revision: D22877264
fbshipit-source-id: 5b3c42580d2b1d73dc0abb48bcf4ff063b2f581f