Text below splash screen on Android

I am using Xamarin Forms.

In my Android project I have a file MainAcitivity.cs. Using this file I set splash screen in my application

MainActivity.cs

    [Activity(Label = "aaa", Icon = "@drawable/icon", Theme = "@style/MainTheme.Splash", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        protected override void OnCreate(Bundle bundle)
        {
            TabLayoutResource = Resource.Layout.Tabbar;
            ToolbarResource = Resource.Layout.Toolbar;

            base.SetTheme(Resource.Style.MainTheme);
            base.OnCreate(bundle);


            global::Xamarin.Forms.Forms.Init(this, bundle);
            LoadApplication(new App());
        }
    }

styles.xml

<?xml version="1.0" encoding="utf-8" ?>
<resources>
  <style name="MainTheme" parent="MainTheme.Base">
  </style>
  <style name="MainTheme.Base" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="windowNoTitle">true</item>
    <item name="windowActionBar">false</item>
    <item name="android:windowFullscreen">true</item>
    <item name="android:windowContentOverlay">@null</item>
    <item name="windowActionModeOverlay">true</item>
    <item name="android:datePickerDialogTheme">@style/AppCompatDialogStyle</item>
    <item name="drawerArrowStyle">@style/DrawerHamburgerStyle</item>
    <item name="android:colorActivatedHighlight">@android:color/transparent</item>
  </style>
  <style name="MainTheme.Splash" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="android:windowBackground">@drawable/splash_screen</item>
    <item name="android:windowActionBar">true</item>
  </style>
  <style name="DrawerHamburgerStyle" parent="@style/Widget.AppCompat.DrawerArrowToggle">
    <item name="spinBars">true</item>
    <item name="color">@color/primaryDark</item>
  </style>
  <style name="ToolbarStyle" parent="@style/Widget.AppCompat.Toolbar">
    <item name="spinBars">true</item>
    <item name="color">@color/primaryDark</item>
  </style>
  <style name="AppCompatDialogStyle" parent="Theme.AppCompat.Light.Dialog">
    <item name="colorAccent">@color/accent</item>
  </style>
</resources>

splash_screen.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
  <item>
    <color android:color="@color/white"/>
  </item>
  <item>
    <bitmap
        android:src="@drawable/splash"
        android:tileMode="disabled"
        android:gravity="center"/>
  </item>
</layer-list>

How can I display a splash screen with text below it? I need to place under splash screen a label with the information about an author. I was looking over the Internet but still, I don't know how to do that.