updated readme

General Programming/Basic Programming/Extra Long Factorials/Solution.java

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+//     Author: Rodney Shaghoulian
+//     Github: github.com/rshaghoulian
+// HackerRank: hackerrank.com/rshaghoulian
+
+import java.util.Scanner;
+import java.math.BigInteger;
+
+public class Solution {
+    public static void main(String[] args) {
+        Scanner scan = new Scanner(System.in);
+        int n = scan.nextInt();
+        scan.close();
+        System.out.println(factorial(n));
+    }
+    
+    private static BigInteger factorial(int n) {
+        BigInteger result = BigInteger.ONE;
+        while (n > 1) {
+            result = result.multiply(BigInteger.valueOf(n));
+            n--;
+        }
+        return result;
+    }
+}