Update README.md

Warning of CocoaPods

README.md

@@ -2,9 +2,11 @@
 
 [![Platform](https://img.shields.io/badge/Platform-iOS-orange.svg)](https://cocoapods.org/pods/SendbirdLiveSDK)
 [![Languages](https://img.shields.io/badge/Language-Objective--C%20%7C%20Swift-orange.svg)](https://github.com/sendbird/sendbird-live-sdk-ios)
-[![CocoaPods](https://img.shields.io/badge/CocoaPods-compatible-green.svg)](https://cocoapods.org/pods/SendbirdLiveSDK)
 [![Commercial License](https://img.shields.io/badge/License-Commercial-brightgreen.svg)](https://github.com/sendbird/sendbird-live-sdk-ios/blob/main/LICENSE)
 
+> **Warning**
+> Since CocoaPods doesn't maintain their service, we can't upload Live SDK to CocoaPods. Please use SPM instead CocoaPods. 
+
 With Sendbird Live SDK, you can integrate live streaming functionality where users can host and participate in live events. In a live event, hosts can communicate with real-time voice and video while participants can engage in a live event by using chat, which is powered by open channels from Sendbird Chat. 
 
 For more information about the SDK, please refer to our [API Reference](https://sendbird.com/docs/live/v1/ios/ref/index.html).