feat: implement server and client

example/service.go

@@ -0,0 +1,12 @@
+package main
+
+type Foo int
+
+type Args struct {
+	Num1, Num2 int
+}
+
+func (f Foo) Sum(args Args, reply *int) error {
+	*reply = args.Num1 + args.Num2
+	return nil
+}