Uploaded initial version of theme and assorted graphics files
Added name and authorship of theme
Merge pull request #2 from mrjovanovic/master

Not So Serious Theme

As said in another pull request, we are still unsure how a theme switcher will be implemented in Shaarli (shaarli/Shaarli#22). I'll merge this for now and do a bit of cleanup later if needed (for example, unchanged icons/images are not necessary to include in the theme, the CSS can point to the default ones)