Implement React example of WS integration with Flipper

Summary: Create an example of how one can use `js-flipper` in a browser to connect to Flipper over WS.

Reviewed By: mweststrate

Differential Revision: D31688114

fbshipit-source-id: 135f826daeddeda8dca5b3df6504cc2bdc04dd1b

js/react-flipper-example/src/index.tsx

@@ -0,0 +1,20 @@
+/**
+ * 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
+ */
+
+import React from 'react';
+import ReactDOM from 'react-dom';
+
+import App from './App';
+
+ReactDOM.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+  document.getElementById('root')
+);