[Go] Working on a go example plus fixing go grpc code (#6448)

Implemented server.go and half implemented client.go

Finishes implementation for greeter go example

Update grpc code for monster.fbs

Adds a couple of cpp methods

Adhere to gofmt standards

Adds a readme for issues with grpc

grpc/tests/go_test.go

@@ -2,12 +2,14 @@ package testing
 
 import (
 	"../../tests/MyGame/Example"
+	flatbuffers "github.com/google/flatbuffers/go"
 
 	"context"
 	"net"
 	"testing"
 
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/encoding"
 )
 
 type server struct{}
@@ -75,7 +77,7 @@ func TestGRPC(t *testing.T) {
 		t.Fatalf("Failed to listen: %v", err)
 	}
 	ser := grpc.NewServer()
-  encoding.RegisterCodec(flatbuffers.FlatbuffersCodec{})
+	encoding.RegisterCodec(flatbuffers.FlatbuffersCodec{})
 	Example.RegisterMonsterStorageServer(ser, &server{})
 	go func() {
 		if err := ser.Serve(lis); err != nil {