Add pause and resume functionality to freeze game state

[AditiBS]

📌 Description

The game currently forces players to either continue playing or restart if they need a break. This PR adds a pause and resume feature that allows players to temporarily stop the game and continue later from the same state.

The implementation is minimal and focuses only on the requested functionality without altering existing game logic, visuals, or scoring behavior.

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🔗 Related Issue

Closes: #72

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🛠 Changes Made

• Added a Pause / Resume button accessible during gameplay
• Updated button label dynamically between Pause and Resume
• Ensured pause state resets correctly when starting a new game

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✅ Checklist

• I have tested my changes
• My code follows project guidelines
• I have linked the related issue

[FOSSCLUB-LBSITW]

Hi 👋
Thanks for the contribution!
This PR currently has merge conflicts in index.html, script.js, and styles.css.It looks like the branch might be behind the latest main.Could you please pull the latest changes and resolve the conflicts? Let us know if you need help with updating your branch. Thanks!