Documentation: Add deprecation notice (#160)

Add deprecation notice
SAP · Nov 23, 2023 · f17ad18 · f17ad18
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 [![REUSE status](https://api.reuse.software/badge/github.com/SAP/project-piper-action)](https://api.reuse.software/info/github.com/SAP/project-piper-action)
 
+:construction: The master branch is soon to be deprecated. The main branch will become the default branch.
+
 Continuous delivery is a method to develop software with short feedback cycles.
 It is applicable to projects both for SAP Cloud Platform and SAP on-premise platforms.
 SAP implements tooling for continuous delivery in [project "Piper"](https://sap.github.io/jenkins-library/).