First stab at updating contributor instructions.  Git-gurus, please correct as needed (cherry picked from commit 18d4b1702dec68ab3315fc805397b51557420961)
First stab at updating contributor instructions.  Git-gurus, please correct as needed
(cherry picked from commit 18d4b1702dec68ab3315fc805397b51557420961)

Signed-off-by: Laurence Rowe <2d9752ea402607c57636550a19835ef8129e4177@lrowe.co.uk>

ebrehault/diazo,huubbouma/diazo,huubbouma/diazo,huubbouma/diazo,ebrehault/diazo,ebrehault/diazo