Extensive expansion of README, adding core concepts, drivers, license, session storage
Extensive expansion of README, adding core concepts, drivers, license, session storage

theUniC/Stash,alawnchen/Stash,AndrewCarterUK/Stash,alawnchen/Stash,graphis/Stash,jaredtking/Stash,theUniC/Stash,tedious/Stash,graphis/Stash,csburton/Stash,csburton/Stash,jaredtking/Stash,andrerom/Stash,bankiru/Stash,andrerom/Stash,localheinz/Stash,tedious/Stash,AndrewCarterUK/Stash,localheinz/Stash,bankiru/Stash