update README files

DesktopDemo/README.adoc

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+= Desktop Demo Application
+:icons: font
+
+WARNING: This demo uses experimental APIs from the desktop module. The underlying APIs are not stable and may change in future versions without notice.
+
+This is a demonstration application showing how to use the desktop module of our SDK.
+It provides examples of basic usage and common implementation patterns.
+
+== Overview
+
+The DesktopDemo is a simple application that demonstrates:
+
+* Basic setup of a desktop application
+* Implementation of core functionality
+* Common usage patterns
+
+== Running the Demo
+
+[source,bash]
+----
+./gradlew :DesktopDemo:run
+----
+
+== Note
+
+This demo is built using the experimental desktop module. As the underlying APIs may change,
+please ensure you're using compatible versions of all modules.

README.adoc

@@ -77,7 +77,9 @@ developer https://support.yubico.com/support/tickets/new[support ticket] and
 our team will be happy to assist you.
 
 === Support for desktop apps
-WARNING: This is an introductory version and is not intended for production use.
+:icons: font
+
+WARNING: This is an experimental version and is not intended for production use.
 
 Since version 2.8.0, the SDK contains the desktop module, which provides concrete implementations
 of the core interfaces (USB and NFC connectivity) for building desktop Java applications.

desktop/README.adoc

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+= Desktop Module
+:icons: font
+
+WARNING: This module is experimental. The API is not stable and may change in future versions without notice.
+
+This module provides concrete implementations of the core interfaces for desktop Java applications.
+It enables building desktop applications using our SDK.
+
+== Overview
+
+The desktop module is part of our SDK's desktop support, introduced in version 2.8.0.
+It implements the core interfaces necessary for desktop application development.
+
+== Usage
+
+See the DesktopDemo module for examples of how to use this implementation.