add custom domain with images example (cloudflare#96)

examples/custom-domain-for-images.js

@@ -0,0 +1,13 @@
+export default {
+	async fetch(request) {
+		// You can find this in the dashboard, it should look something like this: ZWd9g1K7eljCn_KDTu_MWA
+		const accountHash = '';
+
+		const { pathname } = new URL(request.url);
+
+		// A request to something like cdn.example.com/83eb7b2-5392-4565-b69e-aff66acddd00/public
+		// will fetch "https://imagedelivery.net/<accountHash>/83eb7b2-5392-4565-b69e-aff66acddd00/public"
+
+		return new Response(`https://imagedelivery.net/${accountHash}${pathname}`);
+	},
+};