Allow sending of images in the chat between users and with the admin

[Catrya]

Allow sending of images in the chat between users and with the admin so that users can send proof of payment to the other party, and to the admin in case of a dispute.

[BraCR10]

Hello, I'd like to work on this, could I take it?

[Catrya]

Hi @BraCR10 sure!
Which issue would you prefer to work on first? This one or issue 359?