Add message queue nats-streaming example (#1472)

examples/message-queue/nats-streaming/hello.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"log"
+	"net/http"
+)
+
+// Handler is the entry point for this fission function
+func Handler(w http.ResponseWriter, r *http.Request) {
+	log.Print("Hello, world!")
+	msg := "Hello, world!\n"
+	w.Write([]byte(msg))
+}