Added configuration page to enable and disable the plugin. Allows for future proofing in case there are optional configurations (like the normal mode before support for it was dropped)

src/Jellyfin.Plugin.MediaBar/Configuration/PluginConfiguration.cs

@@ -0,0 +1,15 @@
+using MediaBrowser.Model.Plugins;
+
+namespace Jellyfin.Plugin.MediaBar.Configuration
+{
+    public enum MediaBarState
+    {
+        Disabled,
+        Enabled,
+    }
+    
+    public class PluginConfiguration : BasePluginConfiguration
+    {
+        public MediaBarState Enabled { get; set; } = MediaBarState.Enabled;
+    }
+}