Add posture checks doc

src/components/NavigationDocs.jsx

@@ -62,6 +62,7 @@ export const docsNavigation = [
             { title: 'CLI', href: '/how-to/cli' },
             { title: 'Delete your NetBird account', href: '/how-to/delete-account' },
             { title: 'IdP sync', href: '/how-to/idp-sync' },
+            { title: 'posture checks', href: '/how-to/posture-checks' },
             { title: 'Report bugs and issues', href: '/how-to/report-bug-issues' },
             { title: 'Troubleshooting client issues', href: '/how-to/troubleshooting-client' },
         ],

src/pages/how-to/posture-checks.mdx

@@ -0,0 +1,37 @@
+# Introduction
+
+NetBird enables administrators to manage resource access through the creation of access policies, dictating which peer
+groups can interact. Posture checks serve as an extension to these policies, augmenting their capabilities by allowing
+administrators to enforce access restrictions based on specified criteria. By integrating posture checks seamlessly into
+policy-based ACLs, NetBird evaluates various attributes to determine the eligibility of peers to connect to the network.
+
+
+## Concepts
+
+### NB Version Check
+
+The NB Version check verifies the version of NetBird installed on the device attempting to connect to the network.
+This check ensures that only devices running a specified version of NetBird can gain access, thus preventing outdated or
+incompatible clients from compromising network security.
+
+### OS Version Check
+
+The OS Version check evaluates the operating system (OS) version running on the connecting device.
+This check allows for the enforcement of minimum OS requirements, ensuring that only devices with up-to-date and secure
+operating systems can access network resources.
+
+The check evaluates the actual OS version for Android, Darwin, and iOS, while for Linux and Windows, it assesses the
+kernel version.
+
+### Geo Check
+
+The Geo Check examines the geographical location of the connecting device based on its connection IP address.
+This check allows administrators to enforce access restrictions based on geographic regions.
+
+
+## Managing Posture Checks
+
+### Creating posture check
+### Adding posture check to policy
+### Update posture check
+### Delete posture check