chore: adds beta-info to readme (#2)

Co-authored-by: Vicente Pinto <vicente.pinto@freiheit.com>

Author: MelvinKl

README.md

@@ -1,5 +1,7 @@
 [![GitHub License](https://img.shields.io/github/license/stackitcloud/stackit-sdk-go)](https://www.apache.org/licenses/LICENSE-2.0)
 
+> ⓘ INFO: The STACKIt Python SDK is in beta and in active development.
+
 # Overview
 
 This repository contains the published Python SDKs and releases.