quick blurb about server-rendering

Author: ryanflorence

docs/guides/server-rendering.md

@@ -1,4 +1,32 @@
 Server Rendering
 ================
 
+Server rendering of your app with react router is no different than
+anything else, really, you just pass in the requested path to
+`Router.run` and then use `React.renderToString` instead of
+`React.render`.
+
+```js
+var App = React.createClass({
+  render: function () {
+    return <div>Hi</div>;
+  }
+});
+
+var routes = (
+  <Route handler={App} path="/" />
+);
+
+// if using express it might look like this
+app.use(function (req, res) {
+  // pass in `req.path` and the router will immediately match
+  Router.run(routes, req.path, function(Handler) {
+    var content = <Handler/>;
+    res.render('main', {content: content});
+  });
+});
+```
+
+We'll add some more here soon, but for the adventurous few, this ought
+to get you started.