add PHP 8.1.0-dev Zerodium Backdoor vulnerabilities

PHP/PHP 8.1.0-dev Zerodium Backdoor/README.md

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+# PHP 8.1.0-dev Zerodium Backdoor vulnerabilities
+
+PHP 8.1.0-dev is a development version of PHP. The PHP 8.1.0-dev version was implanted with a backdoor on March 28, 2021, but the backdoor was quickly discovered and removed. When the backdoor exists on the server, the attacker can execute arbitrary code by sending the User-Agentt header.
+
+**FOFA query rule**: [header="PHP/8.1.0"](https://fofa.so/result?qbase64=aGVhZGVyPSJQSFAvOC4xLjAi)
+
+# Demo
+
+![](PHP_Zerodium_Backdoor_vulnerabilities.gif)