Add project files.

HTOLHAST/Sample.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace HTOLHAST
+{
+    public abstract class Sample
+    {
+        public DateTime TimeStamp { get; set; }
+        public string Unit { get; set; }
+
+        public Sample(DateTime timeStamp, string unit)
+        {
+            TimeStamp = timeStamp;
+            Unit = unit;
+        }    
+    }
+
+    // Derived class for Data Logger Sample
+    public class Hameg4040Sample : Sample
+    {
+        public double Value { get; set; }
+        public int Channel { get; set; }
+
+        public Hameg4040Sample(DateTime timeStamp, string unit, double value, int channel ) : base(timeStamp , unit)
+        {
+            Value = value;
+            Channel = channel;
+        }
+    }
+
+    public class Keithley6485Sample : Sample
+    {
+        public double Value { get; set; }
+
+        public Keithley6485Sample(DateTime timeStamp,  double value, string unit) : base(timeStamp, unit)
+        {
+            Value = value;
+        }
+    }
+
+    public class HMP4040Sample : Sample
+    {
+        public double Value { get; set; }
+
+        public HMP4040Sample(DateTime timeStamp, double value, string unit) : base(timeStamp, unit)
+        {
+            Value = value;
+        }
+    }
+}