chore: import upstream snapshot with attribution

examples/grpc-interop/client/main.go

@@ -0,0 +1,43 @@
+// client calls the go-micro Greeter service using a standard gRPC
+// client — no go-micro SDK. This proves any language with gRPC support
+// can call go-micro services.
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log"
+	"time"
+
+	pb "example/proto"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+func main() {
+	addr := flag.String("addr", "localhost:50051", "server address")
+	name := flag.String("name", "World", "name to greet")
+	flag.Parse()
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	conn, err := grpc.NewClient(*addr,
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+	)
+	if err != nil {
+		log.Fatalf("connect: %v", err)
+	}
+	defer conn.Close()
+
+	client := pb.NewGreeterClient(conn)
+
+	resp, err := client.Hello(ctx, &pb.HelloRequest{Name: *name})
+	if err != nil {
+		log.Fatalf("Hello: %v", err)
+	}
+
+	fmt.Printf("Response: %s\n", resp.Message)
+}