Add Photino.NET to README.md

Author: ZX-Ning

README.md

@@ -646,6 +646,7 @@ To the extent possible under law, [Vitali Fokin](https://github.com/quozd) has w
 * [Ookii.Dialogs.Wpf](https://github.com/augustoproiete/ookii-dialogs-wpf) - Enable WPF applications to access common Windows dialogs such as task dialogs, credential dialog, progress dialog, folder browser dialog, and more
 * [Ookii.Dialogs.WinForms](https://github.com/augustoproiete/ookii-dialogs-winforms) - Enable Windows Forms applications to access common Windows dialogs such as task dialogs, credential dialog, progress dialog, folder browser dialog, and more
 * [UNO Platform](https://github.com/unoplatform) - The only platform for building native mobile, desktop and WebAssembly with C#, XAML from a single codebase. Open source and professionally supported. Website: [platform.uno](https://platform.uno/)
+* [photino.NET](https://github.com/tryphotino/photino.NET) - Photino is a lightweight open-source framework for building native, cross-platform desktop applications with Web UI technology.
 
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