Add factorial

du1/fac/src/main/java/cz/cvut/fel/pjv/Main.java

@@ -3,5 +3,13 @@ package cz.cvut.fel.pjv;
 public class Main {
     public static void main(String[] args) {
         System.out.println("Hello, World!");
+
+        public class Factorial {
+            public int factorial(int n) {
+                if (n==1) return 1;
+
+                return n * factorial(n - 1);
+            }
+        }
     }
 }
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