security: Add policy

Author: dimhotepus

SECURITY.md

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+## Security
+
+The Source Authors takes the security of our software products and services
+seriously, which includes all source code repositories managed through our
+GitHub organization, which include
+[Source-Authors](https://github.com/Source-Authors).
+
+If you believe you have found a security vulnerability in any
+Source-Authors-owned repository that meets
+[NIST Computer Security Resource Center definition of a security vulnerability](https://csrc.nist.gov/glossary/term/vulnerability),
+please report it to us as described below.
+
+## Reporting Security Issues
+
+**Please do not report security vulnerabilities through public GitHub issues.**
+
+Instead, please send email to
+[[email protected]](mailto:[email protected]).
+
+You should receive a response within 24 hours. If for some reason you do not,
+please follow up via email to ensure we received your original message. 
+
+Please include the requested information listed below (as much as you can
+provide) to help us better understand the nature and scope of the possible
+issue:
+
+  * Type of issue (e.g. buffer overflow, SQL injection, cross-site scripting,
+	etc.)
+  * Full paths of source file(s) related to the manifestation of the issue
+  * The location of the affected source code (tag/branch/commit or direct URL)
+  * Any special configuration required to reproduce the issue
+  * Step-by-step instructions to reproduce the issue
+  * Proof-of-concept or exploit code (if possible)
+  * Impact of the issue, including how an attacker might exploit the issue
+
+This information will help us triage your report more quickly.
+
+## Preferred Languages
+
+We prefer all communications to be in English.
+
+## Policy
+
+Source-Authors follows the principle of
+[ISO/IEC 29147:2018 Information technology — Security techniques — Vulnerability disclosure](https://www.iso.org/standard/72311.html).