[react-native] Open-source ReactART for native

Libraries/ART/Brushes/ARTLinearGradient.h

@@ -0,0 +1,14 @@
+/**
+ * Copyright (c) 2015-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.
+ */
+
+#import "ARTBrush.h"
+
+@interface ARTLinearGradient : ARTBrush
+
+@end