Add a README file

Author: nicwortel

README.md

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+# phpcs-security-sniffs
+
+phpcs-security-sniffs is a collection of security-focused sniffs for
+[PHP_CodeSniffer](https://github.com/PHPCSStandards/PHP_CodeSniffer/).
+These sniffs will report security vulnerabilities in your PHP code.
+
+This project is inspired
+by [phpcs-security-audit](https://github.com/FloeDesignTechnologies/phpcs-security-audit),
+a similar but no longer maintained project.