add missing snapshot

Author: timdeschryver

aspnetcore/tutorials/first-mongo-app/samples_snapshot/9.x/Book.cs

@@ -0,0 +1,20 @@
+using MongoDB.Bson;
+using MongoDB.Bson.Serialization.Attributes;
+
+namespace BookStoreApi.Models;
+
+public class Book
+{
+    [BsonId]
+    [BsonRepresentation(BsonType.ObjectId)]
+    public string? Id { get; set; }
+
+    [BsonElement("Name")]
+    public string BookName { get; set; } = null!;
+
+    public decimal Price { get; set; }
+
+    public string Category { get; set; } = null!;
+
+    public string Author { get; set; } = null!;
+}