Move logic out the the class libs

PointOfSale/Pos.Models/PriceLineModel.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Pos.Models
+{
+    public class PriceLineModel
+    {
+        public string Name { get; set; } = string.Empty;
+        public int NumberProducts { get; set; }
+        public decimal Price { get; set; }
+        public int Id { get; set; }
+        public bool IsProductGroup { get; set; }
+    }
+}