How do you copy the night sky from the A-frame example scene?

hey I’m having trouble with copying the night sky from the a-fram example scene (Glitch :・゚✧)

I got the black background but I cannt place the star-system into my projecy (looks like its a svg file)
Here is my project link: Glitch :・゚✧

Is it possible someone can help me out on this one?