Add readme

README.md

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+# pbrush
+
+Not much to see here. This is just me expermenting with
+[Socket.io](http://socket.io) and [Bacon.js](http://baconjs.github.io/).
+
+## Instructions
+
+Run `npm install` to install dependencies, start the server with `node index.js`,
+and open your browser to <http://localhost:8080> in two windows to see the
+results.
+
+## Todos (in rough order of importance)
+
+1. Add front-end asset compilation (right now dependencies are served from
+   CDNs, and the CoffeeScript client is compiled on every request)
+2. Remember history, and restore drawing on reconnect
+3. Add multiple 'rooms'
+4. Add different colors/brushes
+5. Add users list