Update README.md - add support plan

README.md

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 With Gemini 2.0, we took the chance to create a unified SDK for mobile developers who want to use Google's GenAI models (Gemini, Veo, Imagen, etc). As part of that process, we took all of the feedback from this SDK and what developers like about other SDKs in the ecosystem to directly work with the [Firebase SDK](https://firebase.google.com/docs/vertex-ai). We don't plan to add anything to this SDK or making any further changes. We know how disruptive an SDK change can be and don't take this change lightly, but our goal is to create an extremely simple and clear path for developers to build with our models so it felt necessary to make this change.
 
 Thank you for building with Gemini and [let us know](https://discuss.ai.google.dev/c/gemini-api/4) if you need any help!
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+**Support Plan for this Repository:**
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+*   **Limited Maintenance:** Development is now restricted to **critical bug fixes only**. No new features will be added.
+*   **Purpose:** This limited support aims to provide stability for users while they transition to the new SDK.
+*   **End-of-Life Date:** All support for this repository (including bug fixes) will permanently end on **September 30, 2025**.