Create README.md

README.md

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+# homekit_wifi_thermostat
+
+A thermostat accessory for remotely controlling central heating.
+This provides a thermostat accessory, You also need a swith accessory and to set up event trigers in the Eve app to make the 
+connection between the thermostat and the switch, hence it's called wifi thermostat as the connection between the thermostat 
+accessory and your central heating device is wireless.
+
+It uses a DH22 to sense the temperature and sets the current_heating_cooling_status based on the other settings of the 
+accessory. It sensd events as the value changes, which can then be acrioned by triggers using the Eve app.
+
+For example when the thermostat set the current_heatting_cooling_status to heat/off, use Eve to trigger the switch accesory 
+to on/off respectively. You can also set timer based events in Eve to control the target_heating_cooling_status, in other 
+words you can create a program of when you want the heating to go on or off.