docs: adding warning notice (#36)

Author: nexus49

README.md

@@ -1,3 +1,6 @@
+> [!WARNING]
+> This Repository is under development and not ready for productive use. It is in an alpha stage. That means APIs and concepts may change on short notice including breaking changes or complete removal of apis.
+
 # Platform-Mesh virtual workspaces
 ![Build Status](https://github.com/platform-mesh/virtual-workspaces/actions/workflows/pipeline.yaml/badge.svg)
 
@@ -77,4 +80,4 @@ Please refer to the [CODE_OF_CONDUCT.md](CODE_OF_CONDUCT.md) file in this reposi
 
 ## Licensing
 
-Copyright 2024 SAP SE or an SAP affiliate company and platform-mesh contributors. Please see our [LICENSE](LICENSE) for copyright and license information. Detailed information including third-party components and their licensing/copyright information is available [via the REUSE tool](https://api.reuse.software/info/github.com/platform-mesh/virtual-workspaces).
+Copyright 2024 SAP SE or an SAP affiliate company and platform-mesh contributors. Please see our [LICENSE](LICENSE) for copyright and license information. Detailed information including third-party components and their licensing/copyright information is available [via the REUSE tool](https://api.reuse.software/info/github.com/platform-mesh/virtual-workspaces).