power factor calculator

[ShoaibAbbasDev]

Describe your change:

• [:heavy_check_mark: ] Add an algorithm?
• [:heavy_check_mark: ] Fix a bug or typo in an existing algorithm?
• [ ] Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
• [ ] Documentation change?

Checklist:

• [:white_check_mark: ] I have read CONTRIBUTING.md.
• [ :white_check_mark: ] This pull request is all my own work -- I have not plagiarized.
• [:heavy_check_mark: ] I know that pull requests will not be merged if they fail the automated tests.
• [:heavy_check_mark: ] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• [:heavy_check_mark: ] All new Python files are placed inside an existing directory.
• [:heavy_check_mark: ] All filenames are in all lowercase characters with no spaces or dashes.
• [:heavy_check_mark: ] All functions and variable names follow Python naming conventions.
• [:heavy_check_mark: ] All function parameters and return values are annotated with Python type hints.
• [:heavy_check_mark: ] All functions have doctests that pass the automated testing.
• [ :heavy_check_mark: ] All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
• [:heavy_check_mark: ] If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".