Update README.md

Author: mrunalnshah

README.md

@@ -10,5 +10,6 @@ Data Structures and Algorithms
 2. [Arrays](https://github.com/mrunalnshah/Algorithms/tree/main/01.%20Array)
     - [Static Array](https://github.com/mrunalnshah/Algorithms/blob/main/01.%20Array/01.%20Static%20Array/static-array.cpp)
     - [Dynamic Array](https://github.com/mrunalnshah/Algorithms/blob/main/01.%20Array/02.%20Dynamic%20Array/dynamic-array.cpp)
+    - [Stack](https://github.com/mrunalnshah/Algorithms/tree/main/01.%20Array/03.%20Stack)
 
 ### CLRS