implement getting image size without reading the whole image

openVulkanoCpp/Image/ImageLoaderPng.cpp

@@ -22,4 +22,9 @@ namespace OpenVulkano::Image
 	{
 		return loadData(buffer.data(), static_cast<int>(buffer.size()));
 	}
+
+	bool ImageLoaderPng::GetImageDimensions(const std::string& filename, int& width, int& height)
+	{
+		return GetDimensionsInternal(filename, width, height);
+	}
 }