Hello world example with gRPC and Go

Short summary

Step-by-step tutorial implementing a gRPC Hello World service in Go with custom Nickname fields. Covers Docker setup, protocol buffer compilation, and running a working server-client pair in Killercoda's Ubuntu sandbox.

• •Sets up gRPC development environment with protoc and Go plugins in Docker
• •Modifies official grpc-go example to use Nickname instead of Name with full code examples
• •Demonstrates protocol buffer compilation and running a functional gRPC service

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