add note re arm64 vs. NEON settings
add note re arm64 vs. NEON settings

alex-schwartzman/card.io-dmz,weianwang/card.io-dmz,alex-schwartzman/card.io-dmz,weianwang/card.io-dmz,devinus/card.io-dmz,alex-schwartzman/card.io-dmz,AlanYen/card.io-dmz,AlanYen/card.io-dmz,AlanYen/card.io-dmz,alex-schwartzman/card.io-dmz,AlanYen/card.io-dmz,weianwang/card.io-dmz,weianwang/card.io-dmz,devinus/card.io-dmz,weianwang/card.io-dmz,devinus/card.io-dmz,devinus/card.io-dmz,AlanYen/card.io-dmz,devinus/card.io-dmz,alex-schwartzman/card.io-dmz