update to readme
update to readme

add a breakdown of release versions (links to be updated...)
GregMJP/PCWG,clembou/PCWG,etraiger/PCWG,lcameron05/PCWG,peterdougstuart/PCWG,MVAppleby/PCWG,coillarach/PCWG,aclerc/PCWG