This patch adds the patch submission cheatsheet to
the contributers guide. Both HTML and PDF docs show
the cheatsheet on its own page.
Right clicking the SVG image in the HTML doc allows
for viewing the image on its own, useful for printing
in high quality.
The exact appearance of of the cheatsheet will depend
on the default monospace font installed.
Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>
