Docs: Added the SECURITY.md file.

Author: pomek

SECURITY.md

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+# Reporting security issues
+
+If you believe you have found a security issue in the CKEditor software, please contact us immediately.
+
+When reporting a suspected security problem, please bear this in mind:
+
+*   Make sure to provide as many details as possible about the vulnerability.
+*   Please do not disclose publicly any security issues until we fix them and publish security releases.
+
+Contact the security team at [email protected]. As soon as we receive the security report, we'll work promptly to confirm the issue and then to provide a security fix.