Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Version | Supported Until | [Supported Until](https://www.qgis.org/en/site/getinvolved/development/roadmap.html#release-schedule)
+--- | ---
+<= 3.2 | Unsupported | 
+3.4 | 31/06/2022 | 17/01/2020
+3.6 | 17/05/2019 | 17/05/2019
+3.8 | 13/09/2019 | 13/09/2019
+3.10 | 31/10/2021 | 15/01/2021
+3.12 | 15/05/2020 | 15/05/2020
+3.14 | 11/09/2020 | 11/09/2020
+3.16 | 31/06/2022 | 15/01/2022
+
+[Reporting Upstream Vulnerability](https://www.mapserver.org/development/bugs.html?highlight=security)
+[Upstream Vulnerability](https://www.cvedetails.com/product/17181/UMN-Mapserver.html)