[Algo] Counting Sort [java]

[gdhameeja]

#377
Going through repo I couldn't find an algo implemented for counting sort in java.
I have created a pull request for the same.

[sangamcse]

GitMate.io thinks possibly related issues are #149 ([Algo] Merge Sort [Java]), #150 ([Algo] Quick Sort [Java]), #223 ([Algo] Selection Sort [java]), #18 ([Algo]: Add Bubble Sort in Java), and #63 ([Algo] Insertion Sort [Java]).

[gdhameeja]

I can take up insertion sort and selections sort.
@sangamcse

[mitrish]

i can help with the java implementation of counting sort. Please assign it to me @gdhameeja

[uemarica]

Hello!
I'm sorry for this time from next time i'll wait for getting assigned to a task.

[gdhameeja]

I already have a pull request #377 in reference to couting sort implementation in java waiting to be merged.