Issue #58: update readme for pier3.0.0 [ci skip]
Issue #58: update readme for pier3.0.0 [ci skip]

rjsargent/gsDevKitHome,GsDevKit/gsDevKitHome,rjsargent/gsDevKitHome,marianopeck/gsDevKitHome,marianopeck/gsDevKitHome,LisaAlmarode/gsDevKitHome,LisaAlmarode/gsDevKitHome,GsDevKit/gsDevKitHome