octave contributing guidelines

[Jaroslav Hajek]

hi all,

here are the first bits for the new "Contributing guidelines" chapter
in Octave manual. This is a pre-alpha-zero version,
so it's probably not worth being applied to public archive - but I
would like to get comments, suggestions, criticisms etc.
changeset attached.

-- 
RNDr. Jaroslav Hajek
computing expert
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz

standards.diff
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