fill in the rest of the tutorial

@ncoghlan but that module is only for including local files?  "sampleproject" is another project.  how would that work.

@Ivoz  I hear you, but I want the tutorial to be mostly "scannable", i.e. not have critical things require following links.  I'm not that worried about the duplication with the metadata stuff.  Even if it did diverge a bit, it's not likely to be very wrong.  If it were really wrong, someone would open a PR to the PUG.