libnmdc: reintroduce sample client as part of main package

src/libnmdc/libnmdc_sample.go

@@ -0,0 +1,38 @@
+// +build ignore
+
+// This sample file demonstrates use of the libnmdc.go library. It's excluded
+//  when building the library package, but you can run it via `go run libnmdc_sample.go`.
+
+package main
+
+import (
+	"fmt"
+	"libnmdc"
+)
+
+func main() {
+
+	opts := libnmdc.HubConnectionOptions{
+		Address: "127.0.0.1",
+		Self:    libnmdc.UserInfo{Nick: "slowpoke9"},
+	}
+	hub := opts.Connect()
+
+	for {
+		event := <-hub.OnEvent
+		switch event.EventType {
+		case libnmdc.EVENT_CONNECTION_STATE_CHANGED:
+			fmt.Printf("Connection -- %s (%s)\n", event.StateChange.Format(), event.Message)
+
+		case libnmdc.EVENT_PUBLIC:
+			fmt.Printf("Message from '%s': '%s'\n", event.Nick, event.Message)
+			if event.Message == "how are you" {
+				hub.SayPublic("good thanks!")
+			}
+
+		default:
+			fmt.Printf("%+v\n", event)
+
+		}
+	}
+}