init hello world

http/helloworld.go

@@ -0,0 +1,9 @@
+package http
+
+import "net/http"
+
+func HelloWorld(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("hello world"))
+	})
+}