Setting to choose release channel

Summary: Add possibility to choose release channel in Flipper Settings

Reviewed By: passy

Differential Revision: D25300775

fbshipit-source-id: 55fc86f0e12b9f3a4603bb40b038f5c0e5f30b3b

desktop/app/src/ReleaseChannel.tsx

@@ -0,0 +1,16 @@
+/**
+ * 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.
+ *
+ * @format
+ */
+
+export enum ReleaseChannel {
+  DEFAULT = 'default',
+  STABLE = 'stable',
+  INSIDERS = 'insiders',
+}
+
+export default ReleaseChannel;