trying out grpc
protoc --go_out=. --go_opt=paths=source_relative --go-grpc_out=. --go-grpc_opt=paths=source_relative helloworld/helloworld.proto
go run greeter_server/main.go --port=50052
or
go run greeter_server/main.go --port=50052
go run greeter_client/main.go --addr=localhost:50052 --name roguexray007
or
go run greeter_client/main.go