Added function to get factorial of number

Algorithms.py

@@ -229,3 +229,10 @@ def gcd(num1: int, num2: int) -> int:
 		else:
 			num2 %= num1
 	return num1 | num2
+
+#Returns the factorial of the number passed in
+def factorial(num: int) -> int:
+	fact = 1
+	for cnt in range(1, num + 1):
+		fact *= cnt
+	return fact