feat: password checker added

[aneeshrs91]

Description

Added a new function to check whether password is strong

Related Issue

Fixes #15

Type of Change

• New feature (non-breaking change which adds functionality)

Changes Made

• Added a new function to check whether password is strong

Testing

Describe the tests you ran and how to reproduce them.

Screenshots

(If applicable)

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Additional Notes

Any additional information or context.