Merge pull request #429 from deven98/master

doc: added sponsors to readme

README.md

@@ -6,6 +6,12 @@ A Flutter plugin to show incoming call in your Flutter app(Custom for Android/Ca
 [![pub points](https://img.shields.io/pub/points/flutter_callkit_incoming?label=pub%20points)](https://pub.dev/packages/flutter_callkit_incoming/score)
 [![Build Status](https://github.com/hiennguyen92/flutter_callkit_incoming/actions/workflows/main.yml/badge.svg)](https://github.com/hiennguyen92/flutter_callkit_incoming/actions/workflows/main.yml)
 
+## Sponsors
+
+Our top sponsors are shown below!
+
+<a href="https://getstream.io/video/sdk/flutter/tutorial/video-calling/?utm_source=Github&utm_medium=Github_Repo_Content_Ad&utm_content=Developer&utm_campaign=Github_Video&utm_term=flutter_callkit" target="_blank"><img width="250px" src="https://stream-blog.s3.amazonaws.com/blog/wp-content/uploads/fc148f0fc75d02841d017bb36e14e388/Stream-logo-with-background-.png"/></a><br/><span><a href="https://getstream.io/video/sdk/flutter/tutorial/video-calling/?utm_source=Github&utm_medium=Github_Repo_Content_Ad&utm_content=Developer&utm_campaign=Github_Video&utm_term=flutter_callkit" target="_blank">Try the Flutter Video Tutorial 📹</a></span>
+
 <a href="https://www.buymeacoffee.com/hiennguyen92" target="_blank"><img src="https://cdn.buymeacoffee.com/buttons/default-orange.png" alt="Buy Me A Coffee" height="41" width="174"></a>
 
 ## :star: Features