Update README with completed/new tasks and prioritization
Update README with completed/new tasks and prioritization

pxpgraphics/Alpha,zhaoguohui/FLEX,Xiaobin0860/FLEX,hugo-/FLEX,nikhildhamsaniya/Alpha,xNUTs/Alpha,Kingside/FLEX,pxpgraphics/Alpha,1yvT0s/FLEX,Automatic/FLEX,hoaquo/FLEX,Legoless/Alpha,iBcker/FLEX,sunfei/FLEX,gank0326/FLEX,OdNairy/Alpha,Suninus/FLEX,jdk89757/FLEX,deer-hope/FLEX,nikhildhamsaniya/Alpha,appspector/FLEX,BrianBatchelder/FLEX,xNUTs/Alpha,lintaoSuper/FLEX,DaidoujiChen/FLEX,msdgwzhy6/FLEX,Flipboard/FLEX,programming086/FLEX,nanonation/FLEX,tttpeng/FLEX,otatime/FLEX,OdNairy/Alpha,tttpeng/FLEX-DatabaseBrowser,erichoracek/FLEX,pjebs/FLEX,xNUTs/Alpha,pxpgraphics/Alpha,pocketgems/FLEX,nikhildhamsaniya/Alpha,NSExceptional/FLEX,OdNairy/Alpha,Legoless/Alpha,fbernardo/FLEX,ramoslin02/FLEX,NSExceptional/FLEX,evliu/FLEX,Flipboard/FLEX