Add graphics to github pages

[pohmelie]

It looks like you have static csv/html files. So this can be hosted by github.

[Neon22]

Yes they are static, I had to do a lot of research to find a way to reference images in the readme.md file. I'll look into how to make references using github.

Currently I'm focussing on making it work when you download to a local machine.
So paths are relative to current zip directory.
I might leave it that way as I don't think I can have it work both ways...