Update README.md

Author: AvinandanBose

README.md

@@ -3836,3 +3836,47 @@ Returns an enumeration of the keys in this table.
 
 </ul>
 </ul>
+
+<h1></h1>
+<h1 align="Center">ConcurrentSkipListMap</h1>
+<ul>
+
+```mermaid
+
+sequenceDiagram
+
+  java.util.concurrent.ConcurrentSkipListMap->>java.lang.Cloneable:implements
+  java.util.concurrent.ConcurrentSkipListMap->>java.io.Serializable:implements
+  java.util.concurrent.ConcurrentSkipListMap->>java.util.concurrent.ConcurrentNavigableMap:implements
+  java.util.concurrent.ConcurrentSkipListMap->>java.util.AbstractMap:extends
+  java.util.concurrent.ConcurrentNavigableMap->>java.util.ConcurrentMap:extends
+  java.util.concurrent.ConcurrentNavigableMap->>java.util.NavigableMap:extends
+  java.util.concurrent.ConcurrentMap->>java.util.Map:extends 
+  java.util.NavigableMap->>java.util.SortedMap:extends 
+  java.util.SortedMap->>java.util.Map:extends
+  java.util.AbstractMap->>java.util.Map:implements
+  java.util.AbstractMap->>java.lang.Object:extends
+
+```
+<h3 align="Center">
+
+```Syntax
+
+public class ConcurrentSkipListMap<K,​V> extends AbstractMap<K,​V> 
+		implements ConcurrentNavigableMap<K,​V>, Cloneable, Serializable
+		
+public abstract class AbstractMap<K,V> extends Object implements Map<K,V>
+
+public interface ConcurrentNavigableMap<K,V> extends ConcurrentMap<K,V>
+                                                 , NavigableMap<K,V>
+                                                 
+public interface ConcurrentMap<K,V> extends Map<K,V>
+public interface NavigableMap<K,V> extends SortedMap<K,V>
+public interface SortedMap<K, V> extends Map<K, V>
+
+```
+
+
+</h3>
+
+</ul>