Added bolierplate to sample Startup.cs

Author: Marcin Drobik

src/React.Sample.Owin/Program.cs

@@ -10,7 +10,6 @@
 using System;
 
 using Microsoft.Owin.Hosting;
-using Microsoft.Owin.StaticFiles.Infrastructure;
 
 namespace React.Sample.Owin
 {

src/React.Sample.Owin/Startup.cs

@@ -1,4 +1,13 @@
-using System;
+/*
+ *  Copyright (c) 2014-2015, Facebook, Inc.
+ *  All rights reserved.
+ *
+ *  This source code is licensed under the BSD-style license found in the
+ *  LICENSE file in the root directory of this source tree. An additional grant 
+ *  of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+using System;
 
 using Microsoft.Owin.FileSystems;
 using Microsoft.Owin.StaticFiles;