Update README.md

Geography/README.md

@@ -1,7 +1,9 @@
-# Alternate Geography Collections
+# Alternate Geography Collections and Audio Language Overlay
 
 Adding these two YMLs will create collections for a seven continent configuration (as opposed to the six UN regions used by the default continent.yml) and a version of the countries.yml which groups countries with low output that are culturally similar - such as 'Balkans', 'Nordic', 'Middle East' and 'Pacific Island'.
 
+The entry overlay file adds a country flag defined by the audio language of the entry. So Mayan gets a Mexican flag, and English gets an English flag for instance.
+
 ```yaml
 libraries:
   Movies:
@@ -33,3 +35,7 @@ libraries:
 **Regions Collection Preview**: <br><br>
 ![TV Shows](https://i.imgur.com/IhRoyCk.png)
 <br>
+
+*Overlay Preview**: <br><br>
+![Overlay](https://i.imgur.com/HvmI1Lb.jpg)
+<br>