Add a readme. Closes #202.

README.md

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+[Habari](http://habariproject.org/)'s starting point
+----------------------------------------------------
+
+This is a fully functioning Habari site ready for you to clone or to fork and customize.
+
+For basic installation into a directory called `htdocs`:
+
+1. Clone the Habari repo to your server: `git clone https://github.com/habari/habari.git htdocs`
+1. Initialize and update the [`system`](system) submodule: `cd htdocs; git submodule update --init`
+1. Load the page in a web browser and follow the installation instructions
+
+See [our wiki](http://wiki.habariproject.org/en/Habari_on_github) for an in-depth description of the various ways you can get and manage your Habari instances. [The wiki](http://wiki.habariproject.org/en/Main_Page) also has much more information, including how to customize Habari and where to get help.