write up some instructions.

README

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+== Introduction ==
+
+GreenScreen is a build monitoring tool that is designed to be used as a dynamic Big Visible Chart (BVC) in your work area.  It lets you add links to your build servers and displays the largest possible information on a monitor so that the team can see the build status from anywhere in the room.
+
+== Getting Started ==
+
+GreenScreen depends on Sinatra to run.  You can install it via rubygems:
+  sudo gem install sinatra
+
+To get the GreenScreen application itself, you can clone it from git here:
+  git clone git://github.com/martinjandrews/greenscreen.git
+
+Or download the project by clicking on the 'download' link on this page:
+  http://github.com/martinjandrews/greenscreen/
+
+Once you've got GreenScreen on your machine, edit the config.yml file to add links to your build servers.  It contains instructions for how you can add the.  GreenScreen has been tested with Hudson, but can be used with any continuous integration server that conforms to the multiple project summary reporting standard described here:
+  http://confluence.public.thoughtworks.org/display/CI/Multiple+Project+Summary+Reporting+Standard
+
+This pretty much means that any of the flavours of cruise control should work too.
+
+Once you've got your configuration, you can start GreenScreen as follows:
+  ruby greenscreen.rb
+
+Then go to this URL in your browser:
+  http://localhost:4567
+
+You should see the status of all of your builds.  The screen will refresh every 15 seconds to keep itself up to date.
+
+NOTE: GreenScreen is set up so that the name of the project will flash when it is building, but neither Safari nor IE support blinking text.  You probably want to use Firefox to get the most value out of it.
+
+If running on Windows, I'd suggest running Firefox in full screen mode.  If on a Mac, either expand the window size to take up as much space as possible, or try finding a plugin that lets you go full screen.