res/drawable/ic_plus.xml

<?xml version="1.0" encoding="utf-8"?>
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     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

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     distributed under the License is distributed on an "AS IS" BASIS,
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<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="@dimen/widget_cell_add_button_drawable_width"
    android:height="18dp"
    android:viewportWidth="19"
    android:viewportHeight="18">
  <path
      android:pathData="M15.5,9.75H10.25V15H8.75V9.75H3.5V8.25H8.75V3H10.25V8.25H15.5V9.75Z"
      android:fillColor="#ffffff"/>
</vector>