docs: Add README

Author: MartinZikmund

UI/WindowingSamples/README.md

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+# Windowing Samples
+
+This sample showcases various windowing APIs in Uno Platform a .NET project focused on demonstrating various window management techniques. This project includes examples of custom windows, full-screen mode, minimizing and maximizing windows, and more. It provides a comprehensive guide for developers looking to implement advanced windowing features in their .NET applications.
+
+![WindowingSamples menu](doc/assets/menu.png)
+
+Most windowing features are currently available on desktop targets of [Uno Platform](https://platform.uno) only (Windows, macOS, and Linux).
+
+## Codebase
+
+* [**CustomWindow.xaml & CustomWindow.xaml.cs**](WindowingSamples/CustomWindow.xaml.cs): Implementation of a custom window type.
+* [**FullScreenModeWindow.xaml & FullScreenModeWindow.xaml.cs**](WindowingSamples/FullScreenModeWindow.xaml.cs): Window set to display in full-screen mode.
+* [**MinimizeMaximizeWindow.xaml & MinimizeMaximizeWindow.xaml.cs**](WindowingSamples/MinimizeMaximizeWindow.xaml.cs): Minimizing and maximizing a window.
+* [**StayOnTopWindow.xaml & StayOnTopWindow.xaml.cs**](WindowingSamples/StayOnTopWindow.xaml.cs): Window that always stays on top of other content.
+* [**WindowTitleWindow.xaml & WindowTitleWindow.xaml.cs**](WindowingSamples/WindowTitleWindow.xaml.cs): Customizing the Window title.
+
+## What is the Uno Platform
+
+[Uno Platform](https://platform.uno) is an open-source .NET platform for building single codebase native mobile, web, desktop, and embedded apps quickly.
+For additional information about Uno Platform or if you have any feedback to share, please refer to the [README.md](../../README.md) file in this Samples repository.