Add new theme TeleMark v1.0

Hello Martin,

finally achieved to do this in GitHub (hopefully correctly ...). So here is the pull request for my first mark theme! It's a relatively clean & simple, kind of "web style" theme.

I understood the images to be logos for the theme - is that correct? If the theme's name has to exactly resemble the style of the h1 heading, please comment and I will change that.

I think you should be able to simulate the merge to review the theme?

Best regards, Christoph