Add hello spell checker sample client app

Bug: 4973788

Change-Id: I938ba499c35d91f2e9dbcd00ae0df64c999b2b95

samples/SpellChecker/SampleSpellCheckerService/res/xml/spell_checker_settings.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2011 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.
+-->
+
+<PreferenceScreen
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:title="@string/sample_settings">
+  <CheckBoxPreference
+     android:title="@string/sample_preference"
+     android:persistent="true"
+     android:defaultValue="true" />
+</PreferenceScreen>