first commit

Software/CSharp/GrovePi/Sensors/LightSensor.cs

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+using System;
+
+namespace GrovePi.Sensors
+{
+    public interface ILightSensor
+    {
+        int SensorValue();
+        double Resistance();
+    }
+
+    internal class LightSensor : ILightSensor
+    {
+        private readonly GrovePi _device;
+        private readonly Pin _pin;
+
+        internal LightSensor(GrovePi device, Pin pin)
+        {
+            if (device == null) throw new ArgumentNullException(nameof(device));
+            device.PinMode(_pin, PinMode.Input);
+            _device = device;
+            _pin = pin;
+        }
+
+        public int SensorValue()
+        {
+            return _device.AnalogRead(_pin);
+        }
+
+        public double Resistance()
+        {
+            var sensorValue = SensorValue();
+            return (double) (1023 - sensorValue)*10/sensorValue;
+        }
+    }
+}