circuit diagram
ATtiny13A pin1 -> Arduino pin 10
ATtiny13A pin5 -> Arduino pin 11
ATtiny13A pin6 -> Arduino pin 12
ATtiny13A pin7 -> Arduino pin 13
ATtiny13A pin 8 -> 5v
ATtiny13A pin4 -> Ground
board URLOpen Arduino IDE -> File -> Preferences
https://mcudude.github.io/MicroCore/package_MCUdude_MicroCore_index.json