fix: Joi Inputs Validation. Fixes #40

[lambeboluwatife]

🛠️ Fixes Issue

Fixed and Closes #40

👨‍💻 Description

• The fix implemented was that the req.body wasn't originally validated with Joi.
• Used joi to validate users' inputs, properly catch all errors, and ensure that all joi validation errors are handled using error.isJoi.
• It enhances the project by validating the data being sent by the users.

📄 Type of Change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update (adds or updates related documentation)

📷 Screenshots/GIFs (if any)

✅ Checklist

• [ ] I am a participant of GSSoC-ext.
• [ ] I have followed the contribution guidelines of this project.
• [ ] I have viewed deployment of my code.
• [ ] My changes generate no new warnings.
• [ ] I have added documentation to explain my changes.

🤝 GSSoC Participation

• [ ] This PR is submitted under the GSSoC program.
• [ ] I have taken prior approval for this feature/fix.

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[divyansh-2005]

@lambeboluwatife plz resolve conflicts

[lambeboluwatife]

@divyansh-2005 I've resolved it