Update README.md

Author: premaseem

README.md

@@ -1,2 +1,8 @@
 # DesignPatternsJava9
-This repo consists Gang of Four Design patterns code on Java 9. Each branch in the repository has code of 1 design pattern. Switch repository to try out different design patterns.
+This repository consists Gang of Four Design patterns code example used for course https://www.packtpub.com/application-development/learn-design-patterns-java-9-video
+
+Each branch in the repository has working example code for 1 design pattern. 
+
+To look at code of Decorator pattern you might have to switch to branch decorator pattern eg. link   https://github.com/premaseem/DesignPatternsJava9/tree/decorator-pattern
+
+Note: This code base will work on Java 9 and above  versions.