Add security reporting documentation.

diff --git a/SECURITY.md b/SECURITY.md
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+Security Policy
+===============
+
+This file describes how security issues are reported and handled, and what the
+expectations are for security issues reported to this project.
+
+
+Responsible Disclosure
+----------------------
+
+With *responsible disclosure*, a security issue (and its fix) is disclosed only
+after a mutually-agreed period of time (the "embargo date").  The issue and fix
+are shared amongst and reviewed by the key stakeholders (Linux distributions,
+OS vendors, etc.) and the CERT/CC.  Fixes are released to the public on the
+agreed-upon date.
+
+> Responsible disclosure applies only to production releases.  A security
+> vulnerability that only affects unreleased code can be fixed immediately
+> without coordination.  Vendors *should not* package and release unstable
+> snapshots, beta releases, or release candidates of this software.
+
+
+Supported Versions
+------------------
+
+All production releases of this software are subject to this security policy.  A
+production release is tagged and given a semantic version number of the form:
+
+    MAJOR.MINOR.PATCH
+
+where "MAJOR" is an integer starting at 1 and "MINOR" and "PATCH" are integers
+starting at 0.  A feature release has a "PATCH" value of 0, for example:
+
+    1.0.0
+    1.1.0
+    2.0.0
+
+Beta releases and release candidates are *not* prodution releases and use
+semantic version numbers of the form:
+
+    MAJOR.MINORbNUMBER
+    MAJOR.MINORrcNUMBER
+
+where "MAJOR" and "MINOR" identify the new feature release version number and
+"NUMBER" identifies a beta or release candidate number starting at 1, for
+example:
+
+    1.0b1
+    1.0b2
+    1.0rc1
+
+
+Reporting a Vulnerability
+-------------------------
+
+Report all security issues to "security AT msweet.org".  Expect a response
+within 5 business days.  Any proposed embargo date should be at least 30 days
+and no more than 90 days in the future.
+
+
+PGP Public Key
+--------------
+
+The following PGP public key can be used for signing security messages.
+
+```
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Comment: GPGTools - https://gpgtools.org
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+-----END PGP PUBLIC KEY BLOCK-----
+```