Add main plugin class

ADComparePlugin.cs

@@ -0,0 +1,33 @@
+using Disco.Data.Repository;
+using Disco.Services.Plugins;
+using Disco.Services.Tasks;
+
+namespace Disco.Plugins.ADCompare
+{
+    [Plugin(
+        Id = "Disco.Plugins.ADCompare",
+        Name = "AD Compare",
+        Author = "Jess",
+        Url = "https://gitea.hideawaygaming.com.au/jessikitty/disco-ad-compare-plugin"
+    )]
+    public class ADComparePlugin : Plugin
+    {
+        public override void Initialize(DiscoDataContext Database)
+        {
+            // Plugin initialisation - nothing required at startup
+        }
+
+        public override void Install(DiscoDataContext Database, ScheduledTaskStatus Status)
+        {
+            Status.UpdateStatus(0, "Installing AD Compare Plugin...");
+            // No database schema changes needed - we read-only compare
+            Status.UpdateStatus(100, "Installation Complete");
+        }
+
+        public override void Uninstall(DiscoDataContext Database, bool UninstallData, ScheduledTaskStatus Status)
+        {
+            Status.UpdateStatus(0, "Uninstalling AD Compare Plugin...");
+            Status.UpdateStatus(100, "Uninstallation Complete");
+        }
+    }
+}