Add a java implementation of the shell sort algorithm.

[Praneeth1-O-1]

Shell Sort is an in-place comparison-based sorting algorithm that generalizes Insertion Sort to allow the exchange of items that are far apart. The idea behind Shell Sort is to improve the efficiency of insertion sort by moving elements over larger gaps in the beginning and gradually reducing the gap, eventually performing a standard insertion sort with smaller gaps.

[Ashrockzzz2003]

Assigned @Praneeth1-O-1

[Shyam-Sundar-Raju]

@Ashrockzzz2003 hey is it possible to reassign this issue to me as its been a long time without progress

[Ashrockzzz2003]

You're already assigned to one. Once that's done. Will assign here as per status.