DOC: Add annotations file for answer key.
DOC: Add annotations file for answer key.

Currently, just provide a way to render to some of the data extracted.
Intended to have more thorough documentation of the spreadsheet,
explaining derivation/calculations in each sheet and column.

YuepengGuo/zipline,iamkingmaker/zipline,dmitriz/zipline,michaeljohnbennett/zipline,DVegaCapital/zipline,aajtodd/zipline,StratsOn/zipline,DVegaCapital/zipline,erikness/AlephOne,AlirezaShahabi/zipline,chrjxj/zipline,semio/zipline,euri10/zipline,kmather73/zipline,otmaneJai/Zipline,stkubr/zipline,jimgoo/zipline-fork,nborggren/zipline,alphaBenj/zipline,dkushner/zipline,CarterBain/AlephNull,davidastephens/zipline,wubr2000/zipline,magne-max/zipline-ja,dhruvparamhans/zipline,alphaBenj/zipline,zhoulingjun/zipline,erikness/AlephOne,michaeljohnbennett/zipline,gwulfs/zipline,umuzungu/zipline,aajtodd/zipline,wubr2000/zipline,dkushner/zipline,quantopian/zipline,kmather73/zipline,MonoCloud/zipline,gwulfs/zipline,bartosh/zipline,semio/zipline,joequant/zipline,enigmampc/catalyst,ChinaQuants/zipline,CarterBain/AlephNull,grundgruen/zipline,CDSFinance/zipline,cmorgan/zipline,keir-rex/zipline,joequant/zipline,morrisonwudi/zipline,keir-rex/zipline,humdings/zipline,nborggren/zipline,CDSFinance/zipline,grundgruen/zipline,sketchytechky/zipline,wilsonkichoi/zipline,jimgoo/zipline-fork,magne-max/zipline-ja,morrisonwudi/zipline,ChinaQuants/zipline,stkubr/zipline,AlirezaShahabi/zipline,bartosh/zipline,otmaneJai/Zipline,Scapogo/zipline,dhruvparamhans/zipline,florentchandelier/zipline,mattcaldwell/zipline,dmitriz/zipline,StratsOn/zipline,sketchytechky/zipline,florentchandelier/zipline,jordancheah/zipline,cmorgan/zipline,mattcaldwell/zipline,humdings/zipline,quantopian/zipline,YuepengGuo/zipline,wilsonkichoi/zipline,Scapogo/zipline,ronalcc/zipline,davidastephens/zipline,jordancheah/zipline,chrjxj/zipline,euri10/zipline,MonoCloud/zipline,iamkingmaker/zipline,ronalcc/zipline,enigmampc/catalyst,umuzungu/zipline,zhoulingjun/zipline