Added the solution of Min Stack in Python

[Ritz2626]

Describe your change:

• [✓] Add an algorithm?
• [x] Fix a bug or typo in an existing algorithm?
• [x] 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 commit message contains Fixes: #{$ISSUE_NO}.