Add version reference documentation for NethSecurity

This document provides a reference for the versions of NethSecurity and their corresponding OpenWrt releases.

Author: cotosso

docs/administrator-manual/about/version_reference.md

@@ -0,0 +1,30 @@
+---
+title: "Version reference"
+sidebar_position: 3
+---
+
+# Version reference
+
+NethSecurity is built on OpenWrt.
+Each NethSecurity image is based on a specific OpenWrt release, which provides the underlying operating system, kernel, network stack, and core packages.
+
+The following table shows the OpenWrt version used by each NethSecurity release.
+
+| NethSecurity version | OpenWrt version |
+| -------------------- | --------------- |
+| 8.8.0-beta3          | 25.12.5         |
+| 8.8.0-beta2          | 25.12.5         |
+| 8.8.0-beta1          | 25.12.4         |
+| 8.7.2                | 24.10.5         |
+| 8.7.1                | 24.10.3         |
+| 8.7.0                | 24.10.3         |
+| 8-24.10.0-ns.1.6.0   | 24.10.0         |
+| 8-24.10.0-ns.1.5.1   | 24.10.0         |
+| 8-24.10.0-ns.1.5.0   | 24.10.0         |
+| 8-23.05.6-ns.1.4.1   | 23.05.6         |
+| 8-23.05.5-ns.1.3.0   | 23.05.5         |
+| 8-23.05.4-ns.1.2.0   | 23.05.4         |
+| 8-23.05.3-ns.1.1.0   | 23.05.3         |
+| 8-23.05.3-ns.1.0.1   | 23.05.3         |
+| 8-23.05.3-ns.1.0.0   | 23.05.3         |
+