Add Rihanna GIF for Status Code 505

[M0nica]

A new Rihanna GIF that captures the meaning of Status Code 505 HTTP Version Not Supported should be added: https://httpstatuses.com/505

Instructions for adding a new status code live here: https://github.com/M0nica/httriri/blob/main/README.md#adding-a-new-status-code