README should mention other necessary packages about grpc-go

[dsymonds]

You shouldn't need to do that explicitly unless you're going to be generating protos. Just using this package does not require that.

[gainward]

You mean generating code from protos, right? I was running through a quick example and had things blow up when I tried:

$ protoc --go_out=plugins=grpc:. todo.proto 
protoc-gen-go: program not found or is not executable
--go_out: protoc-gen-go: Plugin failed with status code 1.

[dsymonds]

Yes, that's what I mean. The generated output should be checked in so you don't have to run protoc unless you're modifying it.

[iamqizhao]

To be clear,

github.com/golang/protobuf/proto is needed because we have imported "github.com/golang/protobuf/proto" for encoding and decoding. But it has been installed automatically when you run "go get google.golang.org/grpc".

github.com/golang/protobuf/proto-gen-go is not required to use grpc package. It is needed when you want to generate code from proto file.

[gainward]

Okay, that's fair. I hadn't noticed the language subdirs in grpc-common and was expecting detailed generation instructions in here.

This is just more of a user flow issue, then, and I'm happy to close it.