added PigeonHoleSort algorithm

Author: criskolonas

Sorts/PigeonHoleSort.js

@@ -39,4 +39,4 @@ function pigeonhole_sort(arr){
 //Driver code
 var arr=Array(8, 3, 2, 7, 4, 6, 8);
 pigeonhole_sort(arr);
-console.log(arr);
+console.log(arr);