Adds a helloworld sample in Go.

README.md

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+gRPC Go Hello World
+===================
+
+PREREQUISITES
+-------------
+
+- This requires Go 1.4.x
+- Requires that [GOPATH is set](https://golang.org/doc/code.html#GOPATH)
+```sh
+$ go help gopath
+$ # ensure the PATH contains $GOPATH/bin or $GOBIN
+$ export PATH=PATH:<your/gopath/bin>
+```
+
+INSTALL
+-------
+
+```sh
+$ export GOPATH=<path/to/your/go/workspace>
+$ go install -u github.com/grpc-common/go/greeter_client
+$ go install -u github.com/grpc-common/go/greeter_server
+```
+
+OPTIONAL - Rebuild the generated code
+-------------------------------------
+
+1 First [install protoc](https://github.com/google/protobuf/blob/master/INSTALL.txt)
+  - For now, this needs to be installed from source
+  - This is will change once proto3 is officially released
+2 Install the protoc Go plugin.
+```sh
+$ go install -a github.com/golang/protobuf/protoc-gen-go
+$ # ensure the PATH contains $GOPATH/bin or $GOBIN
+$ export PATH=PATH:<your/gopath/bin>
+$
+$ # from ths dir; invoke protoc
+$ protoc -I ../protos ../protos/helloworld.proto --go_out=plugins=grpc:.
+```
+
+TRY IT!
+-------
+
+- Run the server
+```sh
+$ greeter_server &
+```
+
+- Run the client
+```sh
+$ greeter_client
+```