Added MangaDex Api. Updated project structure.

MangaReader.Core/Metadata/IMangaMetadataProvider.cs

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+namespace MangaReader.Core.Metadata;
+
+public interface IMangaMetadataProvider
+{
+    SourceManga GetManga(string url);
+}

MangaReader.Core/Metadata/MangaStatus.cs

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+namespace MangaReader.Core.Metadata;
+
+public enum MangaStatus
+{
+    Unknown,
+    Ongoing,
+    Complete
+}

MangaReader.Core/Metadata/MangaWebCrawler.cs

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+using HtmlAgilityPack;
+
+namespace MangaReader.Core.Metadata;
+
+public abstract class MangaWebCrawler : IMangaMetadataProvider
+{
+    public abstract SourceManga GetManga(string url);
+
+    protected virtual HtmlDocument GetHtmlDocument(string url)
+    {
+        HtmlWeb web = new()
+        {
+            UsingCacheIfExists = false
+        };
+
+        return web.Load(url);
+    }
+}

MangaReader.Core/Metadata/SourceManga.cs

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+namespace MangaReader.Core.Metadata;
+
+public class SourceManga
+{
+    public required string Title { get; set; }
+    public string? Description { get; set; }
+    public List<string> AlternateTitles { get; set; } = [];
+    public List<string> Authors { get; set; } = [];
+    public List<string> Artists { get; set; } = [];
+    public MangaStatus Status { get; set; } = MangaStatus.Unknown;
+    public List<string> Genres { get; set; } = [];
+    public DateTime? UpdateDate { get; set; }
+    public long? Views { get; set; }
+    public float? RatingPercent { get; set; }
+    public int? Votes { get; set; }
+    public List<SourceMangaChapter> Chapters { get; set; } = [];
+}

MangaReader.Core/Metadata/SourceMangaChapter.cs

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+namespace MangaReader.Core.Metadata;
+
+public class SourceMangaChapter
+{
+    public int? Volume { get; set; }
+    public required float Number { get; set; }
+    public string? Name { get; set; }
+    public required string Url { get; set; }
+    public long? Views { get; set; }
+    public DateTime? UploadDate { get; set; }
+}