[crossfire] Screenshots on Sourceforge

[Mark Wedel]

  I've added a few screenshots to sourceforge web page.

  A few notes:
  sourceforge has a max screenshot size of 640x480, and will resize anything 
larger to that size.

  It does allow short annotations.

  It allows 6 screenshots per project.

  I have 4 up right now, trying to cover the gtk and gtkv2 client, as well as 
different scenes/options.

  I'll leave the remaining 2 slots for future screenshots or ones that show 
something different enough to warrant it.  Perhaps more with 'action' would be nice.