Create SECURITY.md

Author: mhdcodes

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+`paypal-checkout-sdk` Package requires PHP 7.4 or higher. If you are using an older version of php this package may not function correctly.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 3.0.x   | :white_check_mark: |
+| 2.0.x   | :white_check_mark: |
+| < 2.0   | :x:                |
+
+## Reporting a Vulnerability
+
+Found a bug? Do you have general questions or suggestions for improving the package? Feel free to [create an issue on GitHub](https://github.com/phpjuice/paypal-checkout-sdk/issues), we'll try to address it as soon as possible.
+
+If you discover any security related issues, please email us at phpjuice@gmail.com instead of using the issue tracker.