Add signoff instructions to PR template
Add signoff instructions to PR template

Add instructions for signing off on commits to the PR template and a
link to the DCO action help.

Signed-off-by: Joe Block <13bb081c6ac072ef78a3e348068e2204400d7335@unixorn.net>

voronkovich/awesome-zsh-plugins,unixorn/awesome-zsh-plugins