Added UI app.

MangaReader.Core/HttpService/HttpService.cs

@@ -1,7 +1,16 @@
 namespace MangaReader.Core.HttpService;
 
-public class HttpService(HttpClient httpClient) : IHttpService
+public class HttpService : IHttpService
 {
+    private readonly HttpClient _httpClient;
+
+    public HttpService(HttpClient httpClient)
+    {
+        httpClient.DefaultRequestHeaders.UserAgent.ParseAdd("Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0");
+
+        _httpClient = httpClient;
+    }
+
     public Task<string> GetStringAsync(string url, CancellationToken cancellationToken)
-        => httpClient.GetStringAsync(url, cancellationToken);
+        => _httpClient.GetStringAsync(url, cancellationToken);
 }