Added a note about Facebook auth for iOS

EddyVerbruggen · web-flow · commit d7e8a29195fa · 2016-06-21T13:25:34.000+02:00
diff --git a/README.md b/README.md
@@ -401,6 +401,8 @@ On iOS this is rock solid, but on Android it's work in progress. If you want to
   )
 ```
 
+And also, add [this bit to `app.js`](https://github.com/EddyVerbruggen/nativescript-plugin-firebase-demo/blob/master/Firebase/app/app.js#L5-L34) to give control back to your app after Facebook's auth UI finished.
+
 #### Creating a Password account
 ```js
   firebase.createUser({

Original file line number	Diff line number	Diff line change
`@@ -401,6 +401,8 @@ On iOS this is rock solid, but on Android it's work in progress. If you want to`
`401`	`401`	`)`
`402`	`402`	```
`403`	`403`
	`404`	+And also, add [this bit to `app.js`](https://github.com/EddyVerbruggen/nativescript-plugin-firebase-demo/blob/master/Firebase/app/app.js#L5-L34) to give control back to your app after Facebook's auth UI finished.
	`405`	`+`
`404`	`406`	`#### Creating a Password account`
`405`	`407`	```js
`406`	`408`	`firebase.createUser({`