Added solution for reverse a linked list

[alexishp80]

Pull Request Template

Description

Adding my solution to problem 'Reverse a linked list' in the data structures section of HackerRank. link: https://www.hackerrank.com/challenges/reverse-a-linked-list/problem
The code is properly commented for understanding the solution.
If running in the local machine make sure JDK is installed. No dependency if using an online Java compiler.

Fixes # (issue)
The solution to a Hackerrank question.

How Has This Been Tested?

This solution has passed all tests on HackerRank.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules