Create README.md

Author: SHAKTISINGH2323

Sorting/Pigeonhole Sort/Python/README.md

@@ -0,0 +1,5 @@
+# Pigeonhole sorting 
+It is a sorting algorithm that is suitable for sorting lists of elements where the number of elements and 
+the number of possible key values are approximately the same.
+
+It requires O(n + Range) time where n is number of elements in input array and ‘Range’ is number of possible values in array.