Add functionality of upload File

[PThanushree]

Add a feature to allow users to upload files (images, PDFs) to Cloudinary. This will enable cloud storage and simplify file management.

• Use Cloudinary’s unsigned upload from the frontend or signed upload from the backend.

• Return the uploaded file URL to the app.

• Optionally, show preview of uploaded files.

• Cloud-based storage for user files.

• Seamless integration with existing frontend.

• Improves project usability and scalability.

[github-actions]

Thank you for raising this issue!

We'll review it as soon as possible. We truly appreciate your contributions! ✨

Meanwhile make sure you've visited the README.md, CONTRIBUTING.md, and CODE_OF_CONDUCT.md before creating a PR for this. Also, please do NOT create a PR until this issue has been assigned to you. 😊

[Yukta233]

Hello, I would like to work on this ussue under OSCI'25 . kindly assign me

[PThanushree]

@Sushma-1706 I myself would like to work on this issue please assign this to me under OSI

[Sushma-1706]

Assigned this to @PThanushree