Euler Problem 27 solution script Added (#1466)

* Add files via upload

* Update DIRECTORY.md

* Create sol1.py

* Update sol1.py

* Create __init__.py

* Update DIRECTORY.md

* Delete isotonic.py

* Update sol1.py

* Problem_27_project_euler

* project_euler/Problem_27/sol1.py

* project_euler/Problem_27/sol1.py

* project_euler/problem_27/

* project_euler/problem_27

* project_euler/problem_27

* update sol1 of Euler Problem 27 solution script Added

* Remove slow test, wrap long comments, format with psf/black

* Delete __init__.py

* Add type hints

* Add doctests to function is_prime()

* Rename project_euler/problem_27/project_euler/problem_27/sol1.pysol1.py to project_euler/problem_27/problem_27_sol1.py