Add README.md

Add information about the exercise, what you're supposed to do, how to
access the session, and information about installing, running the server
and testing.

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+Session Exercise
+================
+
+This is an exercise designed to help illustrate how sessions can facilitate
+authentication on the web.
+
+Fill in the route blocks in `app.rb` such that POSTing the accepted user
+credentials to '/' log the user in using the session, and display the logged in
+template.
+
+With `Rack::Session::Cookie`, the session is accessible via a hash called
+`session`.
+
+
+## Installing
+Run
+
+	$ sh setup.sh
+
+to install the required gem dependencies.
+
+
+## Running
+Run
+
+	$ make
+
+to start up the development server and see changes to the app.
+
+
+## Testing
+Run
+
+	$ rake
+
+to run the app's tests.