Allow students to upload PDF files for review (this will be for students to submit their GSoC proposal for review)

[A1L13N]

[Ashutoshx7]

/assign

[github-actions]

Hey @Ashutosh-KARNX7! You're now assigned to this issue. Please finish your PR within 1 day.

[github-actions]

⏳ @Ashutosh-KARNX7, you have been unassigned due to 24+ hours of inactivity. This task is now available for reassignment.

[Inshamhaque]

/assign

[github-actions]

Hey @Inshamhaque! You're now assigned to this issue. Please finish your PR within 1 day.

[Inshamhaque]

@coderabbitai kindly assist with proper code and explanation