Added a simple README to help developers get started with the example.

README.md

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+# Singly API Example
+
+This app is a simple example of how you might integrate with the
+Singly Developer API from an iOS application using the Google OAuth2
+library. As such, it is a very simple app and not intended to show
+best practices of application structure or design.
+
+## How to Use
+
+You will need an OAuth Client ID and Client Secret from Singly in order
+to use the API.
+
+Once you have your Client ID and Client Secret, open the file
+SYViewController.m and replace the values defined at the top of the file
+with your Client ID and Client Secret:
+
+    static NSString *const kMyClientID = @"[your client id]";
+    static NSString *const kMyClientSecret = @"[your client secret]";
+
+## Persistence
+
+There is presently a crashing issue when using the keychain support in
+the Google OAuth2 library. I'm not quite sure why this is happening, so
+keychain persistence is currently disabled in this example.
+
+This means that your OAuth token will not persist between app launches.
+You will need to re-auth each time you launch the example in order for
+any of the API Endpoints to succeed.
+
+I am still looking into why this is happening. Feel free to poke and prod
+and send a pull request if you figure out why.