Update Split example with application icon

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.android.example.split">

    <application android:label="@string/app_title">

        <activity android:name="ActivityMain"

    <application android:label="@string/app_title"

            android:icon="@mipmap/ic_app">

        <activity android:name="ActivityMain">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />