add auction models

Author: HlibPavlyk

src/CoinyProject.Core.Domain/Entities/AlbumElement.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Reflection.PortableExecutable;
 using System.Text;
 using System.Threading.Tasks;
 

src/CoinyProject.Core.Domain/Entities/Auction.cs

@@ -10,5 +10,11 @@ public class Auction
     {
         public int Id { get; set; }
         public AlbumElement Lot { get; set; }
+        public AuctionBet AuctionBet { get; set; }
+        public float StartPrice { get; set; }
+        public float BetDelta { get; set; } 
+        public DateTime StartTime { get; set; }
+        public DateTime ExpirationTime { get; set; }
+        public bool IsSoldEarlier { get; set; }
     }
 }

src/CoinyProject.Core.Domain/Entities/AuctionBet.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CoinyProject.Core.Domain.Entities
+{
+    public class AuctionBet
+    {
+        public int Id { get; set; }
+        public float Price { get; set; }
+        public User User { get; set; }
+    }
+}