Mention that ARR is in preview

Author: FlorianBorn71

articles/remote-rendering/index.yml

@@ -1,7 +1,7 @@
 ### YamlMime:Landing
 
 title: Azure Remote Rendering documentation
-summary: Azure Remote Rendering (ARR) is a service that enables you to render highly complex 3D models in real time on devices such as HoloLens 2.
+summary: Azure Remote Rendering (ARR) is a service that enables you to render highly complex 3D models in real time on devices such as HoloLens 2. ARR is currently in public preview.
 
 metadata:
   title: Azure Remote Rendering documentation

articles/remote-rendering/overview/about.md

@@ -9,6 +9,8 @@ ms.topic: overview
 
 # About Azure Remote Rendering
 
+[!INCLUDE [Preview](../preview-include.md)]
+
 *Azure Remote Rendering* (ARR) is a service that enables you to render high-quality, interactive 3D content in the cloud and stream it in real time to devices, such as the HoloLens 2.
 
 ![Sample model](../media/arr-engine.png)

articles/remote-rendering/overview/system-requirements.md

@@ -9,6 +9,8 @@ ms.topic: article
 
 # System requirements
 
+[!INCLUDE [Preview](../preview-include.md)]
+
 This chapter lists the minimum system requirements to work with *Azure Remote Rendering* (ARR).
 
 ## Development PC

articles/remote-rendering/preview-include.md

@@ -0,0 +1,4 @@
+> [!IMPORTANT]
+> **Azure Remote Rendering** is currently in public preview.
+> This preview version is provided without a service level agreement, and it's not recommended for production workloads. Certain features might not be supported or might have constrained capabilities. 
+> For more information, see [Supplemental Terms of Use for Microsoft Azure Previews](https://azure.microsoft.com/support/legal/preview-supplemental-terms/).