Add documentation on storage structure.
Add documentation on storage structure.

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