Added links to files in README.md

Author: VarunS2002

README.md

@@ -6,47 +6,47 @@ These programs can be imported and used as modules in your programs.
 
 #### Programs:
 
-1. matrix_operations.py
+1. [matrix_operations.py](https://github.com/VarunS2002/Python-Data-Structures-Algorithms/blob/master/matrix_operations.py)
     - Mathematical operations on Matrices
     - Addition
     - Subtraction
     - Multiplication
     - Transpose
 
-2. stack.py
+2. [stack.py](https://github.com/VarunS2002/Python-Data-Structures-Algorithms/blob/master/stack.py)
     - Stack Data Structure
     - Push
     - Pop
     - Top
 
-3. binary_tree_traversal.py
+3. [binary_tree_traversal.py](https://github.com/VarunS2002/Python-Data-Structures-Algorithms/blob/master/binary_tree_traversal.py)
     - Traverse Binary Trees
     - Without any order
     - Pre order
     - In order
     - Post order
 
-4. tower_of_hanoi_stack.py
+4. [tower_of_hanoi_stack.py](https://github.com/VarunS2002/Python-Data-Structures-Algorithms/blob/master/tower_of_hanoi_stack.py)
     - Tower of Hanoi puzzle
     - Uses Stack DS from stack.py as Rods
     - Display Steps
 
-5. factorial.py
+5. [factorial.py](https://github.com/VarunS2002/Python-Data-Structures-Algorithms/blob/master/factorial.py)
     - Factorial of a Positive Integer
     - Iteration (for & while)
     - Recursion
 
-6. factors.py
+6. [factors.py](https://github.com/VarunS2002/Python-Data-Structures-Algorithms/blob/master/factors.py)
     - Factors of Non-Zero Integers
     - Iteration (for & while)
     - Recursion
 
-7. permutations_combinations.py
+7. [permutations_combinations.py](https://github.com/VarunS2002/Python-Data-Structures-Algorithms/blob/master/permutations_combinations.py)
     - Permutations & Combinations
     - nPr
     - nCr
     - Uses factorial.py for calculating factorials
 
-8. pascal_triangle.py
+8. [pascal_triangle.py](https://github.com/VarunS2002/Python-Data-Structures-Algorithms/blob/master/pascal_triangle.py)
     - Pascal's Triangle
     - Uses permutations_combinations.py for calculating nCr