update readme

Author: nick-zh

README.md

@@ -1,2 +1,16 @@
-# php-kafka
-Kafka extension for PHP
+# PHP Kafka extension (php-kafka)
+
+[![Supported librdkafka versions: >= 1.4.0](https://img.shields.io/badge/librdkafka-%3E%3D%201.4.0-blue.svg)](https://github.com/edenhill/librdkafka/releases) 
+[![Supported Kafka versions: >= 0.9](https://img.shields.io/badge/kafka-%3E%3D%200.9-blue.svg)](https://github.com/edenhill/librdkafka/blob/master/INTRODUCTION.md#broker-version-compatibility) 
+![Supported PHP versions: 7.x .. 8.x](https://img.shields.io/badge/php-7.x%20..%208.x-blue.svg)
+[![License: BSD-3](https://img.shields.io/badge/License-BSD--3-green.svg)](https://github.com/php-kafka/php-kafka/blob/main/LICENSE)
+
+## Documentation
+
+## Support
+Join the [Slack Workspace](https://join.slack.com/t/php-kafka/shared_invite/zt-a73huj9v-Nl3n9RjGgjrE8OI4bfsH6Q) or [Gitter](https://gitter.im/php-kafka/php-kafka)
+
+## Credits
+This extension relies on [librdkafka](https://github.com/edenhill/librdkafka)  
+This extension is based on [php-rdkafka](https://github.com/arnaud-lb/php-rdkafka)  
+Many thanks to all [contributors](https://github.com/php-kafka/php-kafka/graphs/contributors) :heart: