Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Security updates are applied only to the latest release.
+
+## Reporting a Vulnerability
+
+If you have discovered a security vulnerability in this project, please report it privately. Do not disclose it as a public issue. This gives us time to work with you to fix the issue before public exposure, reducing the chance that the exploit will be used before a patch is released.
+
+Please disclose it at [security advisory](https://github.com/scanny/python-pptx/security/advisories/new).
+
+Please include as much of the information listed below as you can to help us better understand and resolve the issue:
+
+- The type of issue (e.g., buffer overflow, SQL injection, or cross-site scripting)
+- Affected version(s)
+- Impact of the issue, including how an attacker might exploit the issue
+- Step-by-step instructions to reproduce the issue
+- The location of the affected source code (tag/branch/commit or direct URL)
+- Full paths of source file(s) related to the manifestation of the issue
+- Configuration required to reproduce the issue
+- Log files that are related to this issue (if possible)
+- Proof-of-concept or exploit code (if possible)
+This information will help us triage your report more quickly.