docs: add SECURITY.md

Author: DamCoder

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We actively provide security updates for the following versions of Rapide:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.x.x   | :white_check_mark: |
+| < 2.0.0 | :x:                |
+
+## Reporting a Vulnerability
+
+If you discover a potential security vulnerability in Rapide, please do not open a public issue. Instead, please report it privately to ensure the safety of our users.
+
+Please send an email to **john.lovell@codevalve.com** with the following details:
+
+- A description of the vulnerability.
+- Steps to reproduce the issue.
+- Potential impact.
+
+We will acknowledge your report within 48 hours and provide a timeline for a resolution. We appreciate your help in keeping Rapide secure!
+
+---
+
+*Rapide is a local-first application. While we strive for maximum security, always ensure your journal files and Git remotes are appropriately protected.*