Update README.md

Author: skjha1

README.md

@@ -91,5 +91,19 @@
   - [27 Middle of Linkedlist](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/LinkedList/Basic%20Consept/28%20Middle%20of%20Linkedlist.c)
   - [28 Polynomial of Linkedlist](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/LinkedList/Basic%20Consept/29%20Polynomial%20of%20Linkedlist.c)
     - [Problems on LL](https://github.com/skjha1/Data-Structure-Algorithm/tree/master/LinkedList/Problems)
-* [:red_book:](https://drive.google.com/drive/folders/1VzrX63lw2w44Vr3WL8udBO5Cyc3-W5vc) [Stack](https://github.com/skjha1/Data-Structure-Algorithm/tree/master/LinkedList)
+* [:blue_book:](https://drive.google.com/drive/folders/1VzrX63lw2w44Vr3WL8udBO5Cyc3-W5vc) [Stack](https://github.com/skjha1/Data-Structure-Algorithm/tree/master/Stack)
+  - [01 Operation on stack](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/Stack/01%20Operation%20on%20stack%20c%2B%2B%20.cpp)
+  - [02 Stack using linkedlist](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/Stack/02%20Stack%20using%20linkedlist%20c%2B%2B.cpp)
+  - [03 Parenthesis Balance](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/Stack/03%20Parenthesis%20Balance%20in%20C%2B%2B.cpp)
+  - [04 Infix to postfix](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/Stack/04%20infix%20to%20postfix.cpp)
+  - [05 infix to postfix considering Parenthesis and Associativity using Stack](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/Stack/05%20infix%20to%20postfix%20considering%20Parenthesis%20and%20Associativity%20using%20Stack.cpp)
+  - [06 Evaluation of postfix expression](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/Stack/06%20Evaluation%20of%20postfix%20expression.cpp)
+* [:blue_book:](https://drive.google.com/drive/folders/1VzrX63lw2w44Vr3WL8udBO5Cyc3-W5vc) [Queue](https://github.com/skjha1/Data-Structure-Algorithm/tree/master/Queue)
+  - [01 Queue using array enqueue & dequeue ](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/Queue/01%20Queue%20using%20array%20enqueue%20%26%20dequeue%20.cpp)
+  - [02 C++ Queue using Array](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/Queue/02%20C%2B%2B%20Queue%20using%20Array.cpp)
+  - [03 Circular Queue using Array](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/Queue/03%20Circular%20Queue%20using%20Array%20.cpp)
+  - [04 C++ Circular Queue](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/Queue/04%20C%2B%2B%20Circular%20Queue.cpp)
+  - [05 Queue using Linkedlist](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/Queue/05%20Queue%20using%20Linkedlist%20%20(2).cpp)
+  - [06 DEQueue using Array](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/Queue/06%20DEQueue%20using%20Array%20.cpp)
+  - [07 Queue using two stack](https://github.com/skjha1/Data-Structure-Algorithm/blob/master/Queue/07%20Queue%20using%20two%20stack.cpp)