add the exam chatbot feature

[agarwalhimanshugaya]

Description

1. I implement the chatbot feature
2. It reply user according to the user question

Resolves: #280

Checklist

Before submitting this pull request, kindly verify that the ensuing checkpoints have been reached.

• Have you adhered to the repository's defined coding convention rules?
• Have you updated the 'documentation.md' file with the method/function documentation?
• Have you sent a message along with the result or response?
• Have you used the try-catch technique?
• Has the method/class been added to the documentation (md file)?

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Additional Notes/Comments

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[vercel]

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[github-actions]

Great job, @agarwalhimanshugaya! 🎉 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

[agarwalhimanshugaya]

@hereisSwapnil sr kindly review my pr because after 31st july it is not counted for gssoc