Revise security policy for SharpCoreDB

Updated the security policy to clarify supported versions and reporting process.

Author: MPCoreDeveloper

SECURITY.md

@@ -0,0 +1,33 @@
+# Security Policy
+
+## Supported Versions
+
+Only the **V2 line** of SharpCoreDB is currently supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.x.x   | :white_check_mark: |
+| < 2.0   | :x:                |
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability in SharpCoreDB, please report it **privately**.
+
+### How to report
+Please use GitHub’s private vulnerability reporting feature:
+
+➡️ [Report a vulnerability](https://github.com/MPCoreDeveloper/SharpCoreDB/security/advisories/new)
+
+### What to expect
+- We will acknowledge your report A.S.A.P. and within **48 hours**.
+- You will receive regular updates on the status of your report (at least once per week).
+- If the vulnerability is confirmed:
+  - We will work on a fix as quickly as possible.
+  - A security advisory and patched release will be published once the fix is ready.
+- If the report is declined, we will explain the reason.
+
+### Scope
+- Only vulnerabilities affecting the **V2 line** will be considered.
+- Versions below 2.0 are no longer supported and will not receive security updates.
+
+Thank you for helping keep SharpCoreDB secure.