Create SECURITY.md

Author: root28root

SECURITY.md

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+# Security Policy
+
+**Scope:** All Move packages in this monorepo (`mytoken/`, `escrow/`, `simplenft/`, `minimarket/`, `paysplit/`).
+
+## Supported
+Main branch is supported; tagged releases receive best-effort fixes.
+
+## Reporting a Vulnerability
+- **Email:** 007rootmhz@gmail.com
+- **Discord:** @rootmhz_ (https://discord.com/users/1047911417396875264)
+- **Telegram:** @Nikolai_Rootmhz
+
+Please include:
+- A minimal PoC (unit test or steps).
+- Impact (steal/lock funds? DoS? incorrect accounting?).
+- Affected module and function(s).
+
+**SLA:** I acknowledge within 24–48h and aim for a fix or mitigation in 3–7 days.  
+**No secrets:** never send private keys or seeds.  
+**Credit:** With your consent, I’ll credit you in the CHANGELOG/release notes.