feat: Added deteminant calculation

[Lavanya-Talele]

name: Pull Request 🔄
description: Submit a Pull Request
title: "[PR]: Added determinant calculation to Matrix-Calculator"
body:

• type: textarea
  id: description
  attributes:
  label: Description
  description: It can now calculate determinants when given appropriate input.
  placeholder: What changes are you making?
  validations:
  required: true
• type: dropdown
  id: type-of-change
  attributes:
  label: Type of Change
  description: Mark the relevant option
  options:
  - Select an option
  - Bug fix (non-breaking change which fixes an issue)
  ** New feature (non-breaking change which adds functionality)
  - New mini-project
  - Documentation update
  - UI/UX improvement
  - Code refactoring
  - Other (please describe)
  multiple: false
  validations:
  required: true
• type: textarea
  id: related-issue
  attributes:
  label: Related Issue
  description: Link any related issues here (e.g., Closes [Feature]: Matrix-Calculator: Finding determinant of a matrix #256 )
  placeholder: "Closes [Feature]: Matrix-Calculator: Finding determinant of a matrix #256 "
• type: textarea
  id: testing
  attributes:
  label: How Has This Been Tested?
  description: Describe how you tested your changes
  placeholder: |
  - [] Tested on Windows
  - [ ] Tested on macOS
  - [ ] Tested on Linux
  - [] Multiple test runs completed
  - [**] Edge cases tested
• type: textarea
  id: environment-info
  attributes:
  label: Environment
  description: Please provide your environment details
  placeholder: |
  Python Version:
  OS:
• type: textarea
  id: screenshots
  attributes:
  label: Screenshots (if applicable)
  description: Add screenshots to demonstrate changes, especially for UI updates
• type: checkboxes
  id: checklist
  attributes:
  label: Checklist
  description: Make sure all items are completed before submitting
  options:
  - label: "I have been assigned this issue before raising this PR"
  required: true
  - label: "My code follows the project's style guidelines"
  required: true
  - label: "I have tested my code thoroughly"
  required: true
  - label: "My project runs without errors"
  required: true
  - label: "No external dependencies added (unless necessary)"
  required: false
  - label: "I have updated the README.md (if adding new project)"
  required: false
  - label: "I am participating in GSSoC 2026"
  required: false

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[github-actions]

🎉 Thank you for your contribution!

Your Pull Request has been merged successfully.

We appreciate the time and effort you put into improving this project. Contributions like yours help the repository grow and stay useful for everyone.

If you'd like to contribute again, please check the open issues and make sure you are assigned before opening another Pull Request.

Thanks again for your support! 🙌

[github-actions]

Thanks @Lavanya-Talele! I've added you to the contributors list.