rename csharp code

Summary: new name

Reviewed By: splhack

Differential Revision: D4247106

fbshipit-source-id: 6e1097de104f3a011c78ae65b33e57865b007711

csharp/Yoga/stdafx.cpp

@@ -0,0 +1,17 @@
+/**
+ * Copyright (c) 2014-present, 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.
+ */
+
+// stdafx.cpp : source file that includes just the standard includes
+// Yoga.pch will be the pre-compiled header
+// stdafx.obj will contain the pre-compiled type information
+
+#include "stdafx.h"
+
+// TODO: reference any additional headers you need in STDAFX.H
+// and not in this file