Update README.md (#2040)

LienNguyen2910 · web-flow · commit ec75ba112638 · 2024-07-30T14:12:34.000-04:00
* Update README.md

Add notification on the master branch which is now replaced by the main branch.

* Update README.md

Use new markdown for Warning.
diff --git a/README.md b/README.md
@@ -1,3 +1,5 @@
+>[!WARNING]
+>This branch is deprecated and no longer receives updates. Please use the [latest release](https://github.com/awslabs/amazon-kinesis-video-streams-webrtc-sdk-c/releases/latest) or the [main branch](https://github.com/awslabs/amazon-kinesis-video-streams-webrtc-sdk-c/tree/main).
 <h1 align="center">
   Amazon Kinesis Video Streams C WebRTC SDK
   <br>

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+>[!WARNING]`
	`2`	`+>This branch is deprecated and no longer receives updates. Please use the [latest release](https://github.com/awslabs/amazon-kinesis-video-streams-webrtc-sdk-c/releases/latest) or the [main branch](https://github.com/awslabs/amazon-kinesis-video-streams-webrtc-sdk-c/tree/main).`
`1`	`3`	`<h1 align="center">`
`2`	`4`	`Amazon Kinesis Video Streams C WebRTC SDK`
`3`	`5`	`<br>`