first commit

Software/CSharp/GrovePi/Sensors/AirQualitySensor.cs

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+using System;
+
+
+namespace GrovePi.Sensors
+{
+    public interface IAirQualitySensor
+    {
+        int AirQuality();
+    }
+    internal class AirQualitySensor : IAirQualitySensor
+    {
+        private readonly GrovePi _device;
+        private readonly Pin _pin;
+
+        internal AirQualitySensor(GrovePi device, Pin pin)
+        {
+            if (device == null) throw new ArgumentNullException(nameof(device));
+            device.PinMode(_pin, PinMode.Input);
+            _device = device;
+            _pin = pin;
+        }
+        public int AirQuality()
+        {
+            return _device.AnalogRead(_pin);
+        }
+    }
+}