Fixed some errors being thrown when not needed on Cache.Ensure(). Added ability to send actual mangafile information on the volume() api so we can display to the user.

API/DTOs/MangaFileDto.cs

@@ -0,0 +1,13 @@
+using API.Entities;
+
+namespace API.DTOs
+{
+    public class MangaFileDto
+    {
+        public string FilePath { get; set; }
+        public int Chapter { get; set; }
+        public int NumberOfPages { get; set; }
+        public MangaFormat Format { get; set; }
+        
+    }
+}