Fixed logic of adding values

- Changed logic of addReading()
- Fixed methods according to this edit
- Added docs

include/dataAcquisition.h

@@ -12,7 +12,7 @@ int getSensorsNumber();
 int getSlidingWindowSize();
 bool isFull(int sensorIndex);
 
-void addReading(float value, int sensorIndex);
+void addReading(float value);
 
 float getAverageOnSensor(int sensorIndex);
 float getAverageOnAllSensors();