docs: update readme (#139)

Author: peterdeme

README.md

@@ -26,6 +26,8 @@ You can use this library to access feeds API endpoints server-side.
 
 For the client-side integrations (web and mobile) have a look at the JavaScript, iOS and Android SDK libraries ([docs](https://getstream.io/activity-feeds/)).
 
+> 💡 Note: this is a library for the **Feeds** product. The Chat SDKs can be found [here](https://getstream.io/chat/docs/).
+
 ## ⚙️ Installation