Update README.md

Author: hihozhou

README.md

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 # PHP-OPENCV - PHP extension for Opencv
 
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 [![Build Status](https://travis-ci.org/hihozhou/php-opencv.svg?branch=master)](https://travis-ci.org/hihozhou/php-opencv) [![Minimum PHP Version](https://img.shields.io/badge/php-%3E%3D%207.0-8892BF.svg)](https://php.net/)
 
 
+> **⚠️⚠️ NO LONGER IN ACTIVE DEVELOPMENT | 项目不再维护 ⚠️⚠️** 
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+>Due to personal scheduling reasons, the project has been suspended for maintenance and it is hoped that the project code will provide useful value.
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 ## Document
 - [PHP OpenCV Document](https://doc.phpopencv.org)