Build a File Card Component

[ShriramJana]

Overview
Create a reusable card for displaying a file.

Add FileCard.tsx in src/components/.

Props: filename, uploader, dateUploaded.

Show mock data for now (no backend needed).

[ZeyadAbbas]

I will be completing this issue along with #13 at the same time since they go hand in hand.

[ZeyadAbbas]

UPDATE: Completed structure on the current DB schema, awaiting new schema to be completed with another issue #13 and waiting for finalized design to complete styling.