Added function to comput factorial of number

Algorithms.lua

@@ -1,10 +1,10 @@
 --luaClasses/Algorithms.lua
 --Matthew Ellison
 -- Created: 02-04-19
---Modified: 03-28-19
+--Modified: 06-01-21
 --This is a file of algorithms that I have found it useful to keep around at all times
 --[[
-	Copyright (C) 2019  Matthew Ellison
+	Copyright (C) 2021  Matthew Ellison
 
 	This program is free software: you can redistribute it and/or modify
 	it under the terms of the GNU Lesser General Public License as published by
@@ -353,3 +353,11 @@ function gcd(num1, num2)
 	end
 	return num1 | num2;
 end
+
+function factorial(num)
+	local fact = 1;
+	for cnt = 1, num do
+		fact = fact * cnt;
+	end
+	return fact;
+end