Add SunElevation class

Helios/Source/SunElevation.cs

+using System;
+namespace Helios.Source
+{
+	public class SunElevation
+	{
+        public DateTime Time { get; set; }
+        public int SummerElevation { get; set; }
+        public int WinterElevation { get; set; }
+
+        public SunElevation()
+		{
+		}
+	}
+}
+