Add repo deprecation notice (#780)

Author: leoll2

README.md

@@ -1,3 +1,16 @@
+> [!IMPORTANT]
+> **This repository is deprecated.**
+>
+> The **Geti SDK** provided a Python client for **[Geti v2.x](https://github.com/open-edge-platform/geti_v2)**. It is no longer maintained and does not support **[Geti v3.0+](https://github.com/open-edge-platform/geti)**.
+>
+> Geti v3 exposes its API via an **[OpenAPI specification](https://docs.geti.intel.com/docs/rest-api/openapi-specification)**. We recommend using the specification directly or generating a client for your preferred language with tools such as **[openapi-generator](https://github.com/openapitools/openapi-generator)**.
+>
+> **For new features, issues, documentation, and releases, please refer to the Geti repository:**
+>
+> 👉 **[https://github.com/open-edge-platform/geti](https://github.com/open-edge-platform/geti)**
+
+---
+
 <div align="center">
 
 <p>
@@ -387,4 +400,4 @@ Developers who want to modify the SDK source code should follow the development
 
 Depending on your deployment, Geti SDK may utilize FFmpeg.
 
-FFmpeg is an open source project licensed under LGPL and GPL. See [https://www.ffmpeg.org/legal.html](https://www.ffmpeg.org/legal.html). You are solely responsible for determining if your use of FFmpeg requires any additional licenses. Intel is not responsible for obtaining any such licenses, nor liable for any licensing fees due, in connection with your use of FFmpeg.
+FFmpeg is an open source project licensed under LGPL and GPL. See [https://www.ffmpeg.org/legal.html](https://www.ffmpeg.org/legal.html). You are solely responsible for determining if your use of FFmpeg requires any additional licenses. Intel is not responsible for obtaining any such licenses, nor liable for any licensing fees due, in connection with your use of FFmpeg.