Add service workers guide

src/routes/solid-start/guides/data.json

@@ -1,4 +1,4 @@
 {
 	"title": "Guides",
-	"pages": ["data-fetching.mdx", "data-mutation.mdx"]
+	"pages": ["data-fetching.mdx", "data-mutation.mdx", "service-workers.mdx"]
 }

src/routes/solid-start/guides/service-workers.mdx

@@ -0,0 +1,21 @@
+---
+title: "Service workers"
+---
+
+To register a service worker:
+
+1. Place your service-worker file in the `public` directory (e.g., `public/sw.js`), making it available at the root URL (`/sw.js`).
+2. Add registration logic to the `client.entry.tsx` file.
+
+```tsx {6-11} title="src/client.entry.tsx"
+// @refresh reload
+import { mount, StartClient } from "@solidjs/start/client";
+
+mount(() => <StartClient />, document.getElementById("app")!);
+
+if ("serviceWorker" in navigator && import.meta.env.PROD) {
+	window.addEventListener("load", () => {
+		navigator.serviceWorker.register("/sw.js");
+	});
+}
+```