Fix #173, Create Security Policy

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+For general cFS vulnerabilities please [open a cFS framework issue](https://github.com/nasa/cfs/issues/new/choose).
+
+Please use the "Bug Report" template and provide as much information as possible. Apply appropraite labels for each report. For security related reports, tag the issue with the "security" label.
+
+## Additional Support
+
+For additional support, email us at [email protected]. For help using OSAL and cFS, [subscribe to our mailing list](https://lists.nasa.gov/mailman/listinfo/cfs-community) that includes all the community members/users of the NASA core Flight Software (cFS) product line. The mailing list is used to communicate any information related to the cFS product such as current releases, bug findings and fixes, enhancement requests, community meeting notifications, sending out meeting minutes, etc.
+
+If you wish to report a cybersecurity incident or concern please contact the NASA Security Operations Center either by phone at 1-877-627-2732 or via email address [email protected].