Add recursive factorial implementation in Python

Author: Sourabhyadav09

factorial_recursive.py

@@ -0,0 +1,9 @@
+def factorial(n: int) -> int:
+    """Return factorial of a given number n using recursion."""
+    if n == 0 or n == 1:
+        return 1
+    return n * factorial(n - 1)
+
+
+if __name__ == "__main__":
+    print(factorial(5))  # Output: 120