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

desktop/flipper-server-core/src/utils/WSCloseCode.ts

@@ -7,6 +7,7 @@
  * @format
  */
 
+// Borrowed from https://github.com/strong-roots-capital/websocket-close-codes
 export enum WSCloseCode {
   /**
    * Normal closure; the connection successfully completed whatever