My first attempt was to simply place a skybox into the game with a star background. A skybox is simply a box with an image on it.
As you can see the results are not very pleasing. I tried numerous ways to increase the resolution of the image displayed however nothing seemed to work, including increasing the image size.
I am unsure that it is working 100% correctly at the moment. The screenshot with the dark clouds should show a star background which doesn't seem to be displaying. The second screenshot with the white volumetric clouds seems to be working correctly however has very slow FPS.