docs: updates readme

Author: nunomaduro

README.md

@@ -8,7 +8,10 @@
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-**OpenAI PHP** for Symfony is a supercharged community PHP API client that allows you to interact with the [Open AI API](https://beta.openai.com/docs/api-reference/introduction).
+**OpenAI PHP** for Symfony is a community-maintained PHP API client that allows you to interact with the [Open AI API](https://beta.openai.com/docs/api-reference/introduction). If you or your business relies on this package, it's important to support the developers who have contributed their time and effort to create and maintain this valuable tool:
+
+- Nuno Maduro: **[github.com/sponsors/nunomaduro](https://github.com/sponsors/nunomaduro)**
+- Sandro Gehri: **[github.com/sponsors/gehrisandro](https://github.com/sponsors/gehrisandro)**
 
 > **Note:** This repository contains the integration code of the **OpenAI PHP** for Symfony. If you want to use the **OpenAI PHP** client in a framework-agnostic way, take a look at the [openai-php/client](https://github.com/openai-php/client) repository.