add day 51

Author: MadhavBahl

README.md

@@ -77,6 +77,8 @@ Motivate yourself to code daily till 60 days, and see the magic! Coding will bec
 | [Day 47](./day47) | [Singly Linked List](./day47) | [http://codetoexpress.tech/dc/day47/](http://codetoexpress.tech/dc/day47/) | **Intermediate** |
 | [Day 48](./day48) | [Doubly Linked List](./day48) | [http://codetoexpress.tech/dc/day48/](http://codetoexpress.tech/dc/day48/) | **Intermediate** |
 | [Day 49](./day49) | [MiddleMost Node Search](./day49) | [http://codetoexpress.tech/dc/day49/](http://codetoexpress.tech/dc/day49/) | **Intermediate** |
+| [Day 50](./day49) | [Nth From Last](./day50) | [http://codetoexpress.tech/dc/day50/](http://codetoexpress.tech/dc/day50/) | **Intermediate** |
+| [Day 51](./day51) | [Circular List](./day51) | [http://codetoexpress.tech/dc/day51/](http://codetoexpress.tech/dc/day51/) | **Intermediate** |
 
 ## [More Problems](./BONUS/README.md)
 

day51/JavaScript/circularLis.js

@@ -0,0 +1 @@
+// To Be Added

day51/README.md

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+![cover](./cover.png)
+
+# Day 51 - Circular List
+
+Ques) Given a Linked List, write a function `isCircular()` which returns true if the list is circular, false if it is not.
+
+### Circular Linked List
+
+Circular linked list is a linked list where all nodes are connected to form a circle. A circular linked list can be a singly circular linked list or doubly circular linked list.
+
+Basically, there is no NULL at the end, rather the "last" element points again to the first element.
+
+[ques](./ques.png)
+
+## Solution
+
+## JavaScript Implementation
+
+### [Solution](./JavaScript/nthFromEnd.js)
+
+```js
+// To Be Added
+```