How can I make a projector light render in 2.8 eevee

I want to make a low poly projector and have the projector light look likes its a real light projecting the image in my scene. It would be nice if I could also make dust particles floating in the projectors light.

https://volafile.org/get/CFHGiVCivqkS2/movienight-room-RENDER.blend
sorry for the external link but it’s 60mb so I can’t upload it here