Structure: LinkedList(C++)

[promaroy]

Submission Checklist

• [x] Your pull request targets the master branch of the repository.
• [x] You have only one commit (if not, squash them into one commit).
• [x] You have read the Contributing guidelines and your changes follow them.

Type of Change

• [ ] Bug fix
• [x] New implementation

PR Description

Issue #[Add issue number here.]