implement yande.re source

GallerySources/Gallery.Gelbooru/GallerySource.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Threading.Tasks;
+using Gallery.Util.Interface;
+using Gallery.Util.Model;
+
+namespace Gallery.Gelbooru
+{
+    public class GallerySource : IGallerySource
+    {
+        public string Name => "Gelbooru";
+
+        public string HomePage => "https://gelbooru.com";
+
+        public Task<GalleryItem[]> GetRecentItemsAsync(int page)
+        {
+            throw new NotImplementedException();
+        }
+
+        public void SetCookie()
+        {
+            throw new NotImplementedException();
+        }
+    }
+}