Update README.md

Models/NewReleaseMovieDto.cs

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+namespace Jellyfin.Plugin.NewReleases.Models;
+
+public sealed class NewReleaseMovieDto
+{
+    public string Id { get; set; } = string.Empty;
+
+    public string Name { get; set; } = string.Empty;
+
+    public DateTime PremiereDate { get; set; }
+}

Models/NewReleasesResponse.cs

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+namespace Jellyfin.Plugin.NewReleases.Models;
+
+public sealed class NewReleasesResponse
+{
+    public int TotalRecordCount { get; set; }
+
+    public List<NewReleaseMovieDto> Items { get; set; } = [];
+}