Add sample config

config/sample-chamber.cfg

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+# This file is an example config file for an active chamber heater.
+
+# See docs/Config_Reference.md for a description of parameters.
+
+# Multiple temperature sensors are installed throughout the chamber to
+# measure an average temperature.
+[temperature_sensor chamber1]
+sensor_type: ATC Semitec 104GT-2
+sensor_pin: PA0
+[temperature_sensor chamber2]
+sensor_type: ATC Semitec 104GT-2
+sensor_pin: PA1
+[temperature_sensor chamber3]
+sensor_type: ATC Semitec 104GT-2
+sensor_pin: PA2
+
+[heater_chamber]
+heater_pin: PH5
+sensor_type: temperature_combined
+sensor_list:
+    temperature_sensor chamber1,
+    temperature_sensor chamber2,
+    temperature_sensor chamber3
+maximum_deviation: 10
+control: watermark
+min_temp: 0
+max_temp: 70
+
+[heater_fan chamber_fan]
+pin: PL5
+heater: heater_chamber
+
+# Monitor the heating element to ensure that it doesn't exceed rated
+# temperatures.
+[temperature_sensor chamber_heater_element]
+sensor_type: ATC Semitec 104GT-2
+sensor_pin: PA3
+min_temp: 0
+max_temp: 150