message: adds exit to readme
diff: @@ -182,6 +182,12 @@ void loop() {
  ```
  See example for a more complex version. [OnDemandConfigPortal](https://github.com/tzapu/WiFiManager/tree/master/examples/OnDemandConfigPortal)
  +#### Exiting from the Configuration Portal
  +Normally, once entered, the configuration portal will continue to loop until WiFi credentials have been successfully entered or a timeout is reached.
  +If you'd prefer to exit without joining a WiFi network, say becuase you're going to put the ESP into AP mode, then press the "Exit" button
  +on the main webpage.
  +If started via `autoConnect` or `startConfigPortal` then it will return `false (portalAbortResult)`
  +
  #### Custom Parameters
  You can use WiFiManager to collect more parameters than just SSID and password.
  This could be helpful for configuring stuff like MQTT host and port, [blynk](http://www.blynk.cc) or [emoncms](http://emoncms.org) tokens, just to name a few.
  