Update README.md

Author: nirbenrey

README.md

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+<h1 align="center">⚠️ DEPRECATION NOTICE ⚠️</h1>
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+<p align="center">
+  <strong>This project is no longer actively maintained and will be archived on <span style="color:red">12/08/2025</span>.</strong><br>
+</p>
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 # Service Manager CLI
 
 [![Build Status](https://github.com/Peripli/service-manager-cli/workflows/Go/badge.svg)](https://github.com/Peripli/service-manager-cli/actions)