added dark mode button

[priyashuu]

Description

Related Issues

• Closes ✨[feature Request]: Add Dark Mode Toggle Button #329

Type of PR

• ()

Screenshots / videos (if applicable)

Checklist

• I have gone through the contributing guide
• I have updated my branch and synced it with project main branch before making this PR
• I have performed a self-review of my code
• I have tested the changes thoroughly before submitting this pull request.
• I have provided relevant issue numbers, screenshots, and videos after making the changes.
• I have commented my code, particularly in hard-to-understand areas.

Additional context:

[github-actions]

Great job, @priyashuu! 🎉 Thank you for submitting your pull request. Your contribution is valuable and we appreciate your efforts to improve our project.We will promptly review your changes and offer feedback. Keep up the excellent work! Kindly remember to check our contributing guidelines

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[priyashuu]

@Anjaliavv51 can you please reveiew it and merge it

[priyashuu]

@Anjaliavv51 can you please reveiew it and merge it