add dinky little contributing doc
add dinky little contributing doc

BuildingLink/sentry,jean/sentry,looker/sentry,gencer/sentry,alexm92/sentry,JamesMura/sentry,BuildingLink/sentry,jean/sentry,JamesMura/sentry,zenefits/sentry,looker/sentry,JackDanger/sentry,BuildingLink/sentry,mvaled/sentry,fotinakis/sentry,JamesMura/sentry,gencer/sentry,looker/sentry,beeftornado/sentry,gencer/sentry,ifduyue/sentry,zenefits/sentry,gencer/sentry,jean/sentry,mvaled/sentry,alexm92/sentry,zenefits/sentry,ifduyue/sentry,fotinakis/sentry,mvaled/sentry,fotinakis/sentry,alexm92/sentry,JamesMura/sentry,zenefits/sentry,beeftornado/sentry,mvaled/sentry,fotinakis/sentry,mvaled/sentry,looker/sentry,BuildingLink/sentry,mvaled/sentry,JackDanger/sentry,looker/sentry,jean/sentry,ifduyue/sentry,mitsuhiko/sentry,gencer/sentry,zenefits/sentry,beeftornado/sentry,ifduyue/sentry,mitsuhiko/sentry,BuildingLink/sentry,JackDanger/sentry,jean/sentry,JamesMura/sentry,ifduyue/sentry