Add security policy document

SECURITY.md

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+# Security Policies and Procedures
+
+This document outlines security procedures and general policies for the
+`setup-powerpoint` action tool.
+
+Security updates receive all v1.x releases.
+
+## Reporting a Bug
+
+The team and community take all security bugs seriously.
+Thank you for improving the security of `setup-powerpoint` action.
+We appreciate your efforts and responsible disclosure and
+will make every effort to acknowledge your contributions.
+
+Report security bugs by emailing `oss-security@cisco.com`.
+
+The lead maintainer will acknowledge your email within 48 hours, and will send a
+more detailed response within 48 hours indicating the next steps in handling
+your report. After the initial reply to your report, the security team will
+endeavor to keep you informed of the progress towards a fix and full
+announcement, and may ask for additional information or guidance.
+
+## Disclosure Policy
+
+When the security team receives a security bug report, they will assign it to a
+primary handler. This person will coordinate the fix and release process,
+involving the following steps:
+
+- 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 quickly as possible.
+
+## Comments on this Policy
+
+If you have suggestions on how this process could be improved please submit an
+issue.