Sync files with networkservicemesh/cmd-template

This PR syncs files with https://github.com/networkservicemesh/cmd-template

Revision: https://github.com/networkservicemesh/cmd-template/commits/ff810380ab18fc756ad173d7db269ca6a03e48c0

commit ff810380ab18fc756ad173d7db269ca6a03e48c0
Author: Szilárd Vincze <90055916+szvincze@users.noreply.github.com>
Date:   Tue Nov 29 01:16:58 2022 +0100

    Security policy document for NSM repos. (#109)

    Signed-off-by: Szilard Vincze <szilard.vincze@est.tech>

    Signed-off-by: Szilard Vincze <szilard.vincze@est.tech>

Signed-off-by: NSMBot <nsmbot@networkservicmesh.io>

SECURITY.md

@@ -0,0 +1,9 @@
+# Security Policy
+
+## Reporting a security issue
+
+If you believe you have found a security issue in Network Service Mesh, please send a description of the issue to security@networkservicemesh.io. We will send a confirmation to acknowledge your report, and an additional email with the result of our assessment (normally within 1-2 working days).
+
+## Supported versions
+
+Note that Network Service Mesh is developed and maintained on one track, thus we encourage our users to follow our latest releases. For this reason we only investigate whether the reported issue is affecting the latest release of Network Service Mesh and provide a fix in a patch release on top of the latest release.