Store CompactDisc read offsets in database.

DiscImageChef.Database/Models/CdOffset.cs

@@ -0,0 +1,25 @@
+using System;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace DiscImageChef.Database.Models
+{
+    public class CdOffset : CommonTypes.Metadata.CdOffset
+    {
+        public CdOffset() { }
+
+        public CdOffset(string manufacturer, string model, short offset, int submissions, float agreement)
+        {
+            Manufacturer = manufacturer;
+            Model        = model;
+            Offset       = offset;
+            Submissions  = submissions;
+            Agreement    = agreement;
+            AddedWhen    = ModifiedWhen = DateTime.UtcNow;
+        }
+
+        public int      Id        { get; set; }
+        public DateTime AddedWhen { get; set; }
+        [Index]
+        public DateTime ModifiedWhen { get; set; }
+    }
+}