Update OAuth2 Authentication on README.md

Information is added to indicate what should use for Website URL and Javascript Origins fields on the applications manager.

Author: irfano

README.md

@@ -28,9 +28,9 @@ application and verify that the API calls being made are valid. You can
 create an application or view details for your existing applications with
 our [WordPress.com applications manager][5].
 
-When creating your application, you should select "Native client" for the
-application type. The applications manager currently requires a "redirect URL",
-but this isn't used for mobile apps. Just use "https://localhost".
+When creating your application, you should select "Native client" for the application type.
+The "**Website URL**", "**Redirect URLs**", and "**Javascript Origins**" fields are required but not used for
+the mobile apps. Just use "**[https://localhost](https://localhost)**".
 
 Once you've created your application in the [applications manager][5], you'll
 need to edit the `./gradle.properties` file and change the