Add grpc client and example

examples/grpc_client.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+
+	h "github.com/grpc/grpc-common/go/helloworld"
+	"github.com/myodc/go-micro/client"
+)
+
+// run github.com/grpc/grpc-common/go/greeter_server/main.go
+func main() {
+	req := client.NewRpcRequest("helloworld.Greeter", "SayHello", &h.HelloRequest{
+		Name: "John",
+	}, "application/grpc")
+
+	rsp := &h.HelloReply{}
+	err := client.CallRemote("localhost:50051", "helloworld.Greeter/SayHello", req, rsp)
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	fmt.Println(rsp.Message)
+}