Added solution to Project Euler Q50

[sarthaka1310]

Describe your change:

For #hacktoberfest

Adds a solution for Question 50 on Project Euler as requested in issue #2695

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing.
• All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[dhruvmanila]

Announcement:

@sarthaka1310

This message is sent to all pull requests which are OPEN, NOT MERGED, not containing 'wontfix' label and contains 'Project Euler' or 'Project' or 'Euler' (case doesn't matter) in their title. If this message doesn't apply to your pull request, please ignore this.

Message:

This is to notify all the users submitting a pull request for the Project Euler solution that the README.md file has been updated with all the style requirements necessary for the directory and solution files. Please read through it and make all the necessary changes required to your submission.

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

Please reopen this pull request once you commit the changes requested or make improvements on the code. If this is not the case and you need some help, feel free to seek help from our Gitter or ping one of the reviewers. Thank you for your contributions!