Update README.md

Added a background section.
10 years ago · c4b28a9d36
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 gRPC in 3 minutes (Go)
 ======================

+BACKGROUND
+-------------
+For this sample, we've already generated the server and client stubs from [helloworld.proto](https://github.com/grpc/grpc-common/blob/master/protos/helloworld.proto). 
+
 PREREQUISITES
 -------------