Fixes #2181 - (Really) Adds configuration manager

.gitignore

@@ -24,3 +24,5 @@ UnitTests/TestResults
 demo.*
 
 *.deb
+
+*.tui/

README.md

@@ -40,10 +40,10 @@ _The Documentation matches the most recent Nuget release from the `main` branch
 * **Cross Platform** - Windows, Mac, and Linux. Terminal drivers for Curses, [Windows Console](https://github.com/gui-cs/Terminal.Gui/issues/27), and the .NET Console mean apps will work well on both color and monochrome terminals. 
 * **Keyboard and Mouse Input** - Both keyboard and mouse input are supported, including support for drag & drop.
 * **[Flexible Layout](https://gui-cs.github.io/Terminal.Gui/articles/overview.html#layout)** - Supports both *Absolute layout* and an innovative *Computed Layout* system. *Computed Layout* makes it easy to layout controls relative to each other and enables dynamic terminal UIs.
+* **[Configuration & Themes](https://gui-cs.github.io/Terminal.Gui/articles/config.html)** - Terminal.Gui supports a rich configuration system that allows end-user customization of how the UI looks (e.g. colors) and behaves (e.g. key-bindings).
 * **Clipboard support** - Cut, Copy, and Paste of text provided through the [`Clipboard`](https://gui-cs.github.io/Terminal.Gui/api/Terminal.Gui/Terminal.Gui.Clipboard.html) class.
 * **[Arbitrary Views](https://gui-cs.github.io/Terminal.Gui/api/Terminal.Gui/Terminal.Gui.View.html)** - All visible UI elements are subclasses of the `View` class, and these in turn can contain an arbitrary number of sub-views.
-* **Advanced App Features** - The [Mainloop](https://gui-cs.github.io/Terminal.Gui/api/Terminal.Gui/Terminal.Gui.MainLoop.html) supports processing events, idle handlers, timers, and monitoring file
-descriptors. Most classes are safe for threading.
+* **Advanced App Features** - The [Mainloop](https://gui-cs.github.io/Terminal.Gui/api/Terminal.Gui/Terminal.Gui.MainLoop.html) supports processing events, idle handlers, timers, and monitoring file descriptors. Most classes are safe for threading.
 * **Reactive Extensions** - Use [reactive extensions](https://github.com/dotnet/reactive) and benefit from increased code readability, and the ability to apply the MVVM pattern and [ReactiveUI](https://www.reactiveui.net/) data bindings. See the [source code](https://github.com/gui-cs/Terminal.Gui/tree/master/ReactiveExample) of a sample app in order to learn how to achieve this.
 
 ## Showcase & Examples