Feat: Added Plagiarism checker program

[anuran-roy]

Describe your change:

This program checks for plagiarism in a given body of text. It searches Bing and extracts results from it, and then uses a scoring algorithm (Cosine similarity) to find the similarity, sentence-by-sentence.

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

Checklist:

• [X] I have read CONTRIBUTING.md.
• [X] This pull request is all my own work -- I have not plagiarized.
• [X] I know that pull requests will not be merged if they fail the automated tests.
• [X] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• [X] All new Python files are placed inside an existing directory.
• [X] All filenames are in all lowercase characters with no spaces or dashes.
• [X] All functions and variable names follow Python naming conventions.
• [X] All function parameters and return values are annotated with Python type hints.
• [ ] All functions have doctests that pass the automated testing.

[anuran-roy]

@cclauss can you please help with the test cases, even a bit? I am getting confused as to how I can implement the test cases.😅

[stale[bot]]

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.