add side

ModpackUpdater.Model/InstallAction.cs

@@ -6,4 +6,5 @@ public class InstallAction
     public string ZipPath { get; set; }
     public string DestPath { get; set; }
     public string DownloadUrl { get; set; }
+    public Side Side { get; set; } = Side.Both;
 }

ModpackUpdater.Model/Side.cs

@@ -0,0 +1,12 @@
+using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
+
+namespace ModpackUpdater.Model;
+
+[JsonConverter(typeof(StringEnumConverter)), Flags]
+public enum Side
+{
+    Client = 1,
+    Server = 2,
+    Both = Client | Server,
+}