Added MangaDex Api. Updated project structure.

MangaReader.Core/HttpService/HttpService.cs

@@ -2,5 +2,6 @@
 
 public class HttpService(HttpClient httpClient) : IHttpService
 {
-    public Task<string> GetStringAsync(string url) => httpClient.GetStringAsync(url);
+    public Task<string> GetStringAsync(string url, CancellationToken cancellationToken)
+        => httpClient.GetStringAsync(url, cancellationToken);
 }