add one more howto so github etc. can publish good things

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+# Security Policy
+
+All security vulnerabilities should be reported to security@freeradius.org
+
+All security disclosures are published on the FreeRADIUS web site, at https://www.freeradius.org/security/
+
+## Supported Versions
+
+We accept security reports for version 3.0, 3.2, and for the git
+"master" branch, as seen in the table below.
+
+| Version    | Supported          | 
+| ---------- | ------------------ |
+| "master"   | :white_check_mark: |
+| 3.2.x      | :white_check_mark: |
+| 3.0.x      | :white_check_mark: |
+| < 3.0      | :x:                |
+
+### Git "master" branch.
+
+We accept security reports for the "master" branch.  However, please
+be aware that while this branch will eventually become version 4.0.0,
+we have not yet made an official release.
+
+The "master" branch may have temporary issues as development
+continues.  The "master" branch may even have compile failures from
+time to time.
+
+### Version 3.2.x
+
+Version 3.2 is the currently supported release stream.  We accept
+security reports, feature requests, bug reports, etc. for this branch.
+
+### Version 3.0.x
+
+Version 3.0 is the current "stable" release stream.  It is officially
+"end of life", and no further development is being done on that
+branch.
+
+We accept security reports for this branch, but we do not accept
+feature requests or bug reports, for this branch.
+
+### Versions before 3.0
+
+We do not accept security notifications for versions before 3.0.
+
+All older versions of FreeRADIUS are officially not just "end of
+life", but are "end of support".  No code changes will be made to
+those versions, even for security vulnerabilities.
+
+## Reporting a Vulnerability
+
+All security vulnerabilities should be reported to security@freeradius.org
+
+### PGP Key
+
+The following PGP key can be used to sign messages which are sent to
+security@freeradius.org.  The key is also available on PGP key servers
+(for aland@freeradius.org), and on the FreeRADIUS web site at
+https://www.freeradius.org/pgp/aland@freeradius.org
+
+
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+Version: GnuPG v1.0.6 (GNU/Linux)
+Comment: For info see http://www.gnupg.org
+
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