New feature “Text and reading options” for SetupWizard, Wallpaper, and Settings (7/n).

Add new preview mail content layout, but all new strings are not final version.

Bug: 211503117
Test: make
Change-Id: If57e1fd3ba9a994f5175a18bccd1abb77f7d6a34

res/layout/accessibility_text_reading_preview_mail_content.xml

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Copyright (C) 2022 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.
+-->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical">
+
+    <TextView
+        android:id="@+id/subject"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/accessibility_text_reading_preview_mail_subject"
+        android:textAppearance="?android:attr/textAppearanceMedium" />
+
+    <TextView
+        android:id="@+id/from"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:paddingBottom="16dp"
+        android:paddingTop="11dp"
+        android:text="@string/accessibility_text_reading_preview_mail_from"
+        android:textColor="?android:attr/textColorSecondary" />
+
+    <TextView
+        android:id="@+id/content"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/accessibility_text_reading_preview_mail_content"
+        android:textAppearance="?android:attr/textAppearanceMedium" />
+</LinearLayout>