feat(example): add example for directory discovery

example/directory_discovery.dart

@@ -0,0 +1,29 @@
+// Copyright 2024 Contributors to the Eclipse Foundation. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
+// ignore_for_file: avoid_print
+
+import "package:dart_wot/binding_http.dart";
+import "package:dart_wot/core.dart";
+
+Future<void> main(List<String> args) async {
+  final servient = Servient(
+    clientFactories: [
+      HttpClientFactory(),
+    ],
+  );
+
+  final wot = await servient.start();
+  // FIXME(JRKhb): The "things" property currently points to "localhost",
+  //               preventing this example from working
+  final url = Uri.parse("https://zion.vaimee.com/.well-known/wot");
+
+  final thingDiscovery = await wot.exploreDirectory(url);
+
+  await for (final thingDescription in thingDiscovery) {
+    print(thingDescription);
+  }
+}