[Thread] add demoapp for Thread network APIs

A screenshot of the demo app:
![](https://screenshot.googleplex.com/AsiYKPzG4nJpr6x.png)

Bug: 273227725
Change-Id: I8d9bcf00bb54d3f152c436b56df919d967c5b71b
diff --git a/thread/demoapp/Android.bp b/thread/demoapp/Android.bp
new file mode 100644
index 0000000..da7a5f8
--- /dev/null
+++ b/thread/demoapp/Android.bp
@@ -0,0 +1,39 @@
+// Copyright (C) 2023 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+android_app {
+    name: "ThreadNetworkDemoApp",
+    srcs: ["java/**/*.java"],
+    min_sdk_version: "34",
+    resource_dirs: ["res"],
+    static_libs: [
+        "androidx-constraintlayout_constraintlayout",
+        "androidx.appcompat_appcompat",
+        "androidx.navigation_navigation-common",
+        "androidx.navigation_navigation-fragment",
+        "androidx.navigation_navigation-ui",
+        "com.google.android.material_material",
+        "guava",
+    ],
+    libs: [
+        "framework-connectivity-t",
+    ],
+    certificate: "platform",
+    privileged: true,
+    platform_apis: true,
+}