vibed a cached downloader for images

include/services/textureCache.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <string>
+#include <unordered_map>
+
+#include "gdkmm/texture.h"
+#include "glibmm/refptr.h"
+
+class TextureCacheService {
+  public:
+    static TextureCacheService *getInstance();
+
+    Glib::RefPtr<Gdk::Texture> getTexture(const std::string &url);
+
+  private:
+    TextureCacheService() = default;
+
+    std::unordered_map<std::string, Glib::RefPtr<Gdk::Texture>> cache;
+};