[Backend] Add model and routes for gallery

[ankiiitraj]

Description

required endpoints:
get /galary
post /galary - protected
delete /galary - protected

Screenshots/testimonials

N/A

[ankiiitraj]

Working on it!

[EmperorYP7]

Whats the progress on this?

[ankiiitraj]

I totally forgot about it! I'll now start working on it! Thanks for the remainder

[EmperorYP7]

What about adding an AWS S3 instance for gallery and other files?

[ankiiitraj]

So once the app is official, we will use the hg official mail to signup for these services.