Add missing collection model

LANCommander/Data/Models/Collection.cs

@@ -0,0 +1,15 @@
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Text.Json.Serialization;
+
+namespace LANCommander.Data.Models
+{
+    [Table("Collections")]
+    public class Collection : BaseModel
+    {
+        public string Name { get; set; }
+        [JsonIgnore]
+        public virtual ICollection<Game> Games { get; set; }
+        [JsonIgnore]
+        public virtual ICollection<Role> Roles { get; set; }
+    }
+}