Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The following versions of the BACnet Stack C library are
+currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.0.x   | :white_check_mark: |
+| 0.9.x   | :x:                |
+| 0.8.x   | :white_check_mark: |
+| 0.7.x   | :x:                |
+| < 0.6.x | :x:                |
+
+## Reporting a Vulnerability
+
+Please use the "bugs" feature of Sourceforge.net to report a vulnerability,
+where it will be tracked until it is resolved.
+https://sourceforge.net/p/bacnet/bugs/