Create Security policy file

Author: dkulp

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+In general, the FPP team only supports the "latest release".   Any bug fixes
+are likely to only be done on the master branch and possibly ported to the 
+single "latest" release branch.  Users are strongly encourage to keep 
+up to date with the latest releases of FPP whenever possible.
+
+## Reporting a Vulnerability
+
+FPP is designed to be run as an "appliance" on a secured network and is not 
+intended to be opened up to the entire internet.   As such, security vulnerabilities, 
+while important, are not consider super secret.
+
+Security vulnerabilities should be reported via normal issues logged on GitHub.  Fixes
+should be proposed using the normal Pull Request methods whenever possible.
+
+For further discussions, a thread can be created in the FPP sub-forum at:
+https://falconchristmas.com/forum/index.php/board,8.0.html
+
+Vulnerabilities reported any other way will likely be ignored by the developers.