Adding the costume Rotating Gears to MuhRO

Suggestions
1

Imported from legacy Flarum.
Original author: Religieuses (Flarum #729)

It’ll look perfect for gold Madogear Mechanic costume set.

2

Imported from legacy Flarum.
Original author: Muh (Flarum #1)

@Religieuses Hi there,
it’s part of the Halloween costumes already