Implement basic arithmetic functions in calculator.py

Author: Mahadev-05

calculator.py

@@ -0,0 +1,13 @@
+def add(a, b):
+       return a + b
+   
+   def subtract(a, b):
+       return a - b
+   
+   def multiply(a, b):
+       return a * b
+   
+   def divide(a, b):
+       if b == 0:
+           raise ValueError("Cannot divide by zero")
+       return a / b