Update Readme.md

Author: wisdompeak

Readme.md

@@ -514,6 +514,7 @@
 [708.Insert-into-a-Cyclic-Sorted-List](https://github.com/wisdompeak/LeetCode/tree/master/Linked_List/708.Insert-into-a-Cyclic-Sorted-List) (H-) 
 [1474.Delete-N-Nodes-After-M-Nodes-of-a-Linked-List](https://github.com/wisdompeak/LeetCode/tree/master/Linked_List/1474.Delete-N-Nodes-After-M-Nodes-of-a-Linked-List) (M+) 
 [1670.Design-Front-Middle-Back-Queue](https://github.com/wisdompeak/LeetCode/tree/master/Linked_List/1670.Design-Front-Middle-Back-Queue) (M+) 
+[1756.Design-Most-Recently-Used-Queue](https://github.com/wisdompeak/LeetCode/tree/master/Linked_List/1756.Design-Most-Recently-Used-Queue) (H) 
 
 #### [Dynamic Programming](https://github.com/wisdompeak/LeetCode/tree/master/Dynamic_Programming)
 [264.Ugly-Number-II](https://github.com/wisdompeak/LeetCode/tree/master/Dynamic_Programming/264.Ugly-Number-II) (M+)