Models: Add Entities/ folder

Elwig/Models/Entities/WbKg.cs

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+using Microsoft.EntityFrameworkCore;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Elwig.Models.Entities {
+    [Table("wb_kg"), PrimaryKey("KgNr")]
+    public class WbKg {
+        [Column("kgnr")]
+        public int KgNr { get; set; }
+
+        [Column("glnr")]
+        public int? GlNr { get; set; }
+
+        [ForeignKey("KgNr")]
+        public virtual AT_Kg AtKg { get; private set; }
+
+        [ForeignKey("GlNr")]
+        public virtual WbGl Gl { get; private set; }
+
+        [InverseProperty("Kg")]
+        public virtual ISet<WbRd> Rds { get; private set; }
+
+        [NotMapped]
+        public WbGem Gem => AtKg.Gem.WbGem;
+
+        [NotMapped]
+        public WineOrigin Origin => Gem.Origin;
+    }
+}