Add Random Password Generator Snippet

[joharkhan99]

Hello maintainers,

I'm excited to contribute a new code snippet to the "30-seconds/30-seconds-of-code" repository. This pull request adds a snippet for generating random passwords with customizable lengths and character sets.

Changes:

Added password-generator.md with the new snippet.
Included an explanation of how the function works.
Provided example usages and outputs.
This snippet can be a valuable addition to the repository, offering a secure way to generate strong passwords. I've tested the snippet locally to ensure its functionality.

I'm looking forward to hearing your feedback and any suggestions for improvement.

Best regards,
Johar Khan

[Chalarangelo]

Thank you for your contribution. However, as mentioned in numerous issues and PRs in the past, security is besides the scope of this repository and I don't want to attempt putting out any content that might end up causing security breaches or problems for people. I believe it's better to leave security matters, no matter how trivial, to the experts and avoid giving advice or providing code for such things. Cheers! 🍻