finalize model for option sets

ModpackUpdater/InstallOptionSet.cs

@@ -1,9 +1,24 @@
-namespace ModpackUpdater;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
+using System.ComponentModel;
+
+namespace ModpackUpdater;
 
 public class InstallOptionSet
 {
     public string Id { get; set; }
+
+    [DefaultValue(null)]
+    public string Description { get; set; }
+
+    [DefaultValue(Side.Both)]
+    [JsonConverter(typeof(StringEnumConverter))]
+    public Side Side { get; set; } = Side.Both;
+
+    [DefaultValue(false)]
     public bool Multiselect { get; set; }
-    public string DefaultValue { get; set; }
+
+    public List<int> Defaults { get; } = [];
+
     public List<InstallOption> Options { get; } = [];
 }