Add protobuf manifest
Add protobuf manifest

Summary: Adding protobuf manifest, which will be used to compile f4d/velox.

Reviewed By: spershin

Differential Revision: D25926384

fbshipit-source-id: 08a2dffc9e9baa0d393e5f648ce99ca032a9df5f

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift