Expanded Further readings for insertion sort and selection sort

Further readings for insertion sort and selection sort

Insertion sort:
-sentinel version of straight insertion sort
-binary search
-binary insertion sort
-recursive version of insertion sort
-shell sort
-library sort
-tree sort(?)
-TAOCP Exercise in 5.2.1

Selection sort:
-stable version of selection sort.
-bidirectional version of selection sort.
-comparison with insertion sort.
-comparison with bubble sort
-recursive version of insertion sort
-cycle sort
-heap sort variants
     -tournament sort
     -smoothsort. 
-TAOCP Exercise in 5.23