Update README.md

Plugin.cs

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+using MediaBrowser.Common.Configuration;
+using MediaBrowser.Common.Plugins;
+using MediaBrowser.Model.Serialization;
+
+namespace Jellyfin.Plugin.NewReleases;
+
+public sealed class Plugin : BasePlugin<PluginConfiguration>
+{
+    public static Plugin? Instance { get; private set; }
+
+    public Plugin(IApplicationPaths applicationPaths, IXmlSerializer xmlSerializer)
+        : base(applicationPaths, xmlSerializer)
+    {
+        Instance = this;
+    }
+
+    public override string Name => "Jellyfin New Releases";
+
+    public override Guid Id => new("cc3f7cd7-e910-4f09-bf89-e9c7ba7fca77");
+
+    public override string Description => "Provides newly released movies based on PremiereDate.";
+}