Added Security Policy

Author: Geolim4

SECURITY.md

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+# Security Policy
+If you discover any vulnerability please be aware of the following table of supported versions below.
+Then feel free to contact me at the email address provided in the bottom of that page.
+
+## Supported Versions
+| Version | End of support       | End of life        |
+| ------- | -------------------- | ------------------ |
+| 8.0     | Not yet planned      | Not yet planned    |
+| 7.1     | July 2021            | July 2022          |
+| 7.0     | July 2019            | July 2020          |
+| 6.0     | July 2020            | July 2021          |
+| 5.0     | July 2018            | July 2019          |
+| 4.0     | July 2017            | January  2018      |
+| < 4.0   | N/A                  | N/A                |
+
+More details on the [Wiki](https://github.com/PHPSocialNetwork/phpfastcache/wiki/%5BV4%CB%96%5D-Global-support-timeline)
+
+## Reporting a Vulnerability
+If you discover any security vulnerability contact me at contact#at#geolim4.com with a subject formatted like that:\
+`[PHPFASTCACHE][VULNERABILITY] Your subject goes here`
+
+Thanks in advance for taking the time to report me that in private.