Add some basic documentation

README.md

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+Showdown
+========================================================================
+
+Showdown is a simulator of Pokemon battles. It currently only supports Generation 5 (Pokemon Black and Pokemon White).
+
+Installing
+------------------------------------------------------------------------
+
+Showdown requires Node.js (and perhaps also Socket.IO).
+
+Copy config/config-example.js into config/config.js, and edit as you please.
+
+After this, start Node:
+
+    cd <location of PS>
+    node app.js
+
+Visit your server at `http://play.pokemonshowdown.com/?server=SERVER&serverport=PORT`
+
+Replace SERVER with your server domain or IP, and PORT with the server's port (default is 8000).
+
+Currently, this workflow works for testing Pokemon Showdown and testing your patches before submitting pull requests, but I wouldn't recommend running a production server this way. I'll make it easier to host your own server in the future.

config/config-example.js

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+// The server port - the port to run Pokemon Showdown under
+exports.port = 8000;
+
+// The server ID - a unique ID describing this Showdown server
+exports.serverid = 'showdown';
+
+// The server token - a token to access the login database and ladder on pokemonshowdown.com
+// This token must be registered for accessing the ladder, but you will still be able to login with an unregistered token.
+exports.servertoken = '';
+
+// login server URL - don't forget the http:// and the trailing slash
+// this is the URL of the user database and ladder mentioned earlier
+exports.loginserver = 'http://play.pokemonshowdown.com/';