Created problem_44 in project_euler (#2348)

* Create __int__.py

* Update and rename project_euler/__int__.py to project_euler/problem_44/__int__.py

* Add files via upload

* Update sol1.py

* Update __int__.py

* Delete __int__.py

* Create __init__.py

* Update project_euler/problem_44/sol1.py

Co-authored-by: Christian Clauss <cclauss@me.com>

* Update project_euler/problem_44/sol1.py

Co-authored-by: Christian Clauss <cclauss@me.com>

* Update project_euler/problem_44/sol1.py

Co-authored-by: Christian Clauss <cclauss@me.com>

Co-authored-by: Christian Clauss <cclauss@me.com>