Added Copyright Header

Reviewed By: davidaurelio

Differential Revision: D10462700

fbshipit-source-id: edef1f6f5825835bbdb613a1934bf7bfe86d0ee6

build.gradle

@@ -1,3 +1,10 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {