Add Big Sur themes

Author: t1m0thyj

README.md

@@ -14,3 +14,13 @@ Themes ported from macOS to WinDynamicDesktop
 ## [Catalina](https://github.com/t1m0thyj/WDD-mac-themes/releases/tag/catalina)
 
 ![Catalina](images/Catalina.jpg)
+
+## [Big Sur](https://github.com/t1m0thyj/WDD-mac-themes/releases/tag/big-sur)
+
+**Big Sur**
+
+![Big Sur](images/Big_Sur.jpg)
+
+**Big Sur Abstract**
+
+![Big Sur Abstract](images/Big_Sur_Abstract.jpg)