Adding initial auction system

Models/Auction.cs

@@ -0,0 +1,24 @@
+using MongoDB.Bson;
+using MongoDB.Bson.Serialization.Attributes;
+
+namespace GameAuthApi.Models;
+
+public class Auction
+{
+    [BsonId]
+    [BsonRepresentation(BsonType.ObjectId)]
+    public string Id { get; set; }
+
+    [BsonRepresentation(BsonType.ObjectId)]
+    public string ItemId { get; set; }
+
+    [BsonRepresentation(BsonType.ObjectId)]
+    public string SellerPlayerId { get; set; }
+
+    [BsonRepresentation(BsonType.ObjectId)]
+    public string HighestBidderId { get; set; }
+
+    public int StartingPrice { get; set; }
+    public int CurrentPrice { get; set; }
+    public bool IsClosed { get; set; } = false;
+}

Models/DTOs/BidRequest.cs

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+namespace GameAuthApi.Models;
+
+public class BidRequest
+{
+    public string AuctionId { get; set; }
+    public int BidAmount { get; set; }
+}

Models/DTOs/CreateAuctionRequest.cs

@@ -0,0 +1,7 @@
+namespace GameAuthApi.Models;
+
+public class CreateAuctionRequest
+{
+    public string ItemId { get; set; }
+    public int StartingPrice { get; set; }
+}