update README.md with the counting sort algorithm written in R
update README.md with the counting sort algorithm written in R

batermj/algorithm-challenger,batermj/algorithm-challenger,batermj/algorithm-challenger,batermj/algorithm-challenger,batermj/algorithm-challenger,batermj/algorithm-challenger,batermj/algorithm-challenger,batermj/algorithm-challenger,batermj/algorithm-challenger,batermj/algorithm-challenger,batermj/algorithm-challenger,batermj/algorithm-challenger,batermj/algorithm-challenger,batermj/algorithm-challenger