[Thread] add demoapp for Thread network APIs
A screenshot of the demo app:

Bug: 273227725
Change-Id: I8d9bcf00bb54d3f152c436b56df919d967c5b71b
diff --git a/thread/demoapp/res/values/themes.xml b/thread/demoapp/res/values/themes.xml
new file mode 100644
index 0000000..9cb3403
--- /dev/null
+++ b/thread/demoapp/res/values/themes.xml
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 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.
+-->
+
+<resources xmlns:tools="http://schemas.android.com/tools">
+ <!-- Base application theme. -->
+ <style name="Theme.ThreadNetworkDemoApp" parent="Theme.MaterialComponents.DayNight.NoActionBar">
+ <!-- Primary brand color. -->
+ <item name="colorPrimary">@color/purple_500</item>
+ <item name="colorPrimaryVariant">@color/purple_700</item>
+ <item name="colorOnPrimary">@color/white</item>
+ <!-- Secondary brand color. -->
+ <item name="colorSecondary">@color/teal_200</item>
+ <item name="colorSecondaryVariant">@color/teal_700</item>
+ <item name="colorOnSecondary">@color/black</item>
+ <!-- Status bar color. -->
+ <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
+ <!-- Customize your theme here. -->
+ </style>
+</resources>