Update README to include rake setup too.

Author: davidwinter

README.md

@@ -1,9 +1,19 @@
 You can use this as a start point for managing a WordPress install with git.
 
-In it's current state, all you need to do is clone this repo, `git submodule update --init` then copy `wp-config-sample.php` to `wp-config.php`, update your database settings, and your default theme.
-
 See '[Install and manage WordPress with Git](http://davidwinter.me/articles/2012/04/09/install-and-manage-wordpress-with-git/)' for more details.
 
+## Setup
+
+You can eithe run:
+
+	rake
+
+Or manually run:
+
+	git submodule update --init
+
+Then copy `wp-config-sample.php` to `wp-config.php`, update your database settings, and your default theme.
+
 ## Updating WordPress
 
 You can use the Rake helper task to upgrade WordPress to a specific version: