Added readme

README.markdown

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+# LROAuth2Client Demo Project
+
+This is a simple demo project for the [LROAuth2Client](http://github.com/lukeredpath/LROAuth2Client) library.
+
+You can read more about it on [my blog](http://lukeredpath.co.uk/blog/oauth2-for-iphone-and-ipad-applications.html).
+
+## Getting started
+
+Once you've cloned the project, you'll need to initialize the project submodules:
+
+    git submodule update --init --recursive
+
+Next, you'll need to create a local copy of OAuthCredentials.h in the root of the project. An example file is provided. To actually run the example, you'll need to sign up with the Facebook Graph API and register an application. Enter your app's credentials in this file.
+
+At this stage, everything should build and run.