Add default theme example for older Unity versions

Author: AbandonedCart

README.md

@@ -23,6 +23,8 @@ This plugin is targeted towards Unity 2017.4, however I see no reasons why it sh
 
 ## Alternative solution
 Instead of using the script (or if you want to apply the "render behind the notch" flag as early as possible), you could modify the theme used by Unity. To do so, please create a file at the path `Assets/Plugins/Android/res/values-v28/styles.xml` with the following contents:
+
+Unity 2017.4 or newer
 ```
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
@@ -32,6 +34,16 @@ Instead of using the script (or if you want to apply the "render behind the notc
 </resources>
 ```
 
+Before 2017.4 (ie. 5.6)
+```
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+<style name="UnityThemeSelector" parent="android:Theme.Material.Light.NoActionBar.Fullscreen">
+<item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
+</style>
+</resources>
+```
+
 There is no need to add the script to your project in this case. You may also need to tweak the snippet above if you are using a custom theme.
 
 I recommend using the default approach with the script unless you have good reasons to do otherwise.