Add Project Euler Problem 180 (#4017)

* Added solution for Project Euler problem 180

* Fixed minor details in Project Euler problem 180

* updating DIRECTORY.md

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

fpringle committed 5y ago

b1801398ec339a4e3813b38054f0ec34dfa43bfe

Parent: e7ab06f

Committed by GitHub <noreply@github.com> on 12/9/2020, 11:14:51 AM