pharpend/pumpkin: A printable and/or readable document explaining Snowdrift <https://snowdrift.coop>. We couldn't decide whether to call it the "manifesto", the "book", the "memorandums", the "ukase", etc. So for now it's called the "Snowdrift Pumpkin". @ b87cb3b63e8de346ad0e43e0c2643a6b972cd595