Merge pull request #3129 from hjoliver/add-security-md-8p0

Added SECURITY.md (master)

SECURITY.md

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+# Security Policies and Procedures
+
+This document outlines security procedures and general policies for the Cylc
+project.
+
+  * [Reporting a Bug](#reporting-a-bug)
+  * [Disclosure Policy](#disclosure-policy)
+  * [Comments on this Policy](#comments-on-this-policy)
+
+## Reporting a Bug
+
+The Cylc maintainers take security bugs seriously. Thank you for improving the
+security of Cylc. We appreciate your efforts and responsible disclosure and
+will make every effort to acknowledge your contributions.
+
+Please report security bugs by sending an email to the lead Cylc maintainers,
+[Hilary Oliver](mailto:hilary.oliver@niwa.co.nz) and [Matt
+Shin](matthew.shin@metoffice.gov.uk). If a fix is needed, progress will be
+recorded on Cylc repository Issue page on GitHub, and resulting new releases
+will be announced on the Cylc [mail forum](mailto:cylc@googlegroups.com). 
+
+Report security bugs in third-party modules to the person or team maintaining
+the module.
+
+## Disclosure Policy
+
+When the Cylc maintainers receive a security bug report, they will assign it to
+a primary handler. This person will coordinate the fix and release process as
+follows:
+
+  * Confirm the problem and determine the affected versions.
+  * Audit code to find any potential similar problems.
+  * Prepare fixes for all releases still under maintenance. These fixes will be
+    released as fast as possible.
+
+## Comments on this Policy
+
+If you have suggestions on how this process could be improved please submit a
+pull request.