Update Readme

Author: matths

packages/adapter-node/README.md

@@ -40,11 +40,44 @@ Enables precompressing using gzip and brotli for assets and prerendered pages. I
 By default, the server will accept connections on `0.0.0.0` using port 3000. These can be customised with the `PORT` and `HOST` environment variables:
 
 ```
-HOST=127.0.0.1 PORT=4000 node build
+HOST=127.0.0.1 PORT=4000 node build/server
 ```
 
 You can specify different environment variables if necessary using the `env` option.
 
+## Middleware
+
+Adapter generates a [connect](https://github.com/senchalabs/connect) compatible middleware `(req, res, next) => {}`.
+
+You can have a look at `build/server.js` to study a simple reference implementation
+on how to use this with a plain node http server.
+
+You can of course your favorite server framework to combine with other and/or custom middleware, e.g. [express](https://github.com/expressjs/expressjs.com).
+
+```
+import { handler } from './build/index.js';
+import express from 'express';
+
+const app = express();
+
+var myMiddleware = function (req, res, next) {
+  console.log('see me flighing high.');
+  next();
+};
+
+app.use(myMiddleware);
+
+app.get('/no-svelte', (req, res) => {
+  res.send('This is not svelte!')
+});
+
+// SvelteKit
+app.get('*', handler);
+
+app.listen(3000)
+```
+
+
 ## Advanced Configuration
 
 ### esbuild