[GNC] Add a donate button in GnuCash

[Glenn Fowler]

Hello,
I think it would be an enhancement if there was a "Donate" button in
the GnuCash program. This could simply link to the website donate
page.
It's unobtrusive, gives users a quick way to donate, and hopefully
will increase donation awareness and bring in additional funding to
the project.

This is customary and in many open source software apps & programs.
Thoughts?

(I also posted this on BugZilla as an enhancement)