add median of two sorted array

[BamaCharanChhandogi]

Describe your change:

• 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 include at least one URL that points to Wikipedia or another similar explanation.
• 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".

[BamaCharanChhandogi]

This is the first PR of the Median of two sorted arrays.
@cclauss please check.

[cclauss]

Under what circumstances would this algorithm be used?

[BamaCharanChhandogi]

Thanks for the guidance.

[cclauss]

#9386 (review)

[BamaCharanChhandogi]

I think I have resolved all.

[cclauss]

#9386 (review)

[BamaCharanChhandogi]

You are saying I will add the answer to Your question in docstring.
Right?

[BamaCharanChhandogi]

I request you to add the "HACKTOBERFEST" label.

[BamaCharanChhandogi]

@cclauss check please