[sugar] Hello Journal World!

[Tom Hoffman]

I think what I need to actually get rolling with Sugar development is
a Hello World for the journal.

I'd like to see a tutorial (or just code even) with a Sugar activity
that just takes an entry into a plain text box.  And puts that text
into the journal.  When I click on the journal entry I see the text in
the text box again.  (But I shouldn't have a "save" button?  When do I
save to the journal?)

Obviously existing activities do this kind of thing, but I didn't have
much luck finding out how from digging around (before I gave up and
figured I'd wait for more documentation).

--Tom