Update README.md

Author: AvinandanBose

README.md

@@ -1206,7 +1206,10 @@ sequenceDiagram
  <li> <h3> HashSet and TreeSet can also take the type of ENUM  and add ENUM constants to perform Set operations. </h3> </li> 
   <ul>
     <li><h3><a href= "https://github.com/AvinandanBose/JavaCollectionFramework/blob/main/EnumSetDemo.java" >HashSet, Tree Set and EnumSet</a></h3></li>
-   </ul>
-   <li> <h3> EnumSet inherits methods from Collection. </h3> </li> 
+ </ul>
+ <li> <h3> EnumSet inherits methods from Collection. </h3> </li> 
+<ul>
+<li><h3><a href= "https://github.com/AvinandanBose/JavaCollectionFramework/blob/main/EnumSetDemoA.java" >EnumSet→Collection</a></h3></li>
+</ul>
 
 </ul>