readme updates to highlight huge amount of change in 2.x
readme updates to highlight huge amount of change in 2.x

ausaccessfed/federationregistry,University-of-Auckland/federationregistry2-Tuakiri,REANNZ/federationregistry2-Tuakiri,University-of-Auckland/federationregistry2-Tuakiri,REANNZ/federationregistry2-Tuakiri,ausaccessfed/federationregistry,REANNZ/federationregistry2-Tuakiri,ausaccessfed/federationregistry,University-of-Auckland/federationregistry2-Tuakiri,REANNZ/federationregistry2-Tuakiri,University-of-Auckland/federationregistry2-Tuakiri,ausaccessfed/federationregistry,REANNZ/federationregistry2-Tuakiri,University-of-Auckland/federationregistry2-Tuakiri