Add solution for Project Euler problem 86 (#4025)

* Added solution for Project Euler problem 86

* updating DIRECTORY.md

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

fpringle committed 5y ago

a6f6eb264995c41db646467a0078aa24e4ebec48

Parent: 533e36d

Committed by GitHub <noreply@github.com> on 12/12/2020, 5:19:35 AM