group definitions?

[bsafh]

The readMe says

livingroom_windows: name: Livingroom Windows icon: mdi:window-open-variant all: false entities: - binary_sensor.openclose_1 - binary_sensor.openclose_2 - binary_sensor.openclose_3

but: that would mean - in configuration.yaml - that an integration "livingroom_windows" would be used - obviously, that does not exist

binary_sensors:

• platform: group
• entieties
  • binary_sensor_whatever would make more sense?

and what does

better_thermostat: ..... - windows_sensors: group.whatever ....

mean?

there are no entities group.* in HomeAssistant, so:

please provide better examples...