bug#50880: Add "Contributing to Emacs" help command (see C-h C-h)

[Stefan Kangas]

tags 50880 + patch
thanks

Stefan Kangas <stefan@marxist.se> writes:

> We could pick any key, like "b" for "contriButing".  Or, you know, "h"
> for "Happens to be free".  ;-)

So how about the attached?  I put it on `C-h C-x' because I figured that
we might want to use "b" for "bugs" in the future perhaps, and "u" just
wasn't that nice.  Most of the other ones are taken except for "i", "q",
"r", "y" and "z".

0001-New-help-function-view-emacs-contributing.patch
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