Added some ancient Linux

The SLS variety. I've had these 0.98 disk images floating around for the better part of forever, and I thought I should upload them here. I have a runnable disk image too somewhere when I find it, I'll add it onto here as well.

I also found rdebath's github page with an extracted ISO image and some instructions on reconstituting the image, and I've uploaded the following ISO into here. SLS 1.02 is far more complete than 0.98.