[Feature Request] [Backend] : Implement file download functionality.

### Is your feature request related to a problem? Please describe.

Yes.currently there is no file download feature present in our website and it's a feature that every user need and it's a essential feature to benefit the user.

### Describe the solution you'd like

On the backend , I will be using **express** and **axios** . Axios will be used to fetch the file from a URL as a stream and pipe it to the client. And by using **res.setHeader** it will be downloaded to the system of the user

### Describe alternatives you've considered

_No response_

### Developer Help

_No response_