Add Testcontainers example with Node.js (#1620)

examples/node/README.md

@@ -0,0 +1,30 @@
+### Usage with Testcontainers
+
+See [Java example's
+README](https://github.com/fsouza/fake-gcs-server/tree/main/examples/java#resumable-upload-operations-and-containerised-fake-gcs-server)
+for context.
+
+```ts
+import { Storage } from "@google-cloud/storage";
+import ky from "ky";
+import { GenericContainer } from "testcontainers";
+
+const PORT = 4443;
+
+const CONTAINER = await new GenericContainer("fsouza/fake-gcs-server:1.49.0")
+  .withEntrypoint(["/bin/fake-gcs-server", "-scheme", "http"])
+  .withExposedPorts(PORT)
+  .start();
+
+const API_ENDPOINT = `http://${CONTAINER.getHost()}:${CONTAINER.getMappedPort(
+  PORT
+)}`;
+
+await ky.put(`${API_ENDPOINT}/_internal/config`, {
+  json: { externalUrl: API_ENDPOINT },
+});
+
+const STORAGE = new Storage({ apiEndpoint: API_ENDPOINT });
+
+// ...
+```