How to integrate .proto files in Xcode compilation?

I am trying to port an android app to ios and new to mac/xcode ecosystem. My app uses Google proto buffs and using instructions at https://github.com/alexeyxo/protobuf-swift/blob/master/README.md I am able to build protobuf for swift and add ProtocolBuffers.xcodeproj to my project. I was even able to generate .swift files for my proto files outside of xcode using protoc directly. However, my question is how do I integrate .proto files in Xcode so xcode can find/compile them? Do I need to copy my .proto files manually in my project? I am using Xcode 7.2.1 and protoc version is 3.0.0. Thanks in advance.