docs: add access policy middleware

docs/middleware/access-policy.md

@@ -0,0 +1,32 @@
+---
+title: Access Policy
+layout: default
+parent: Middleware
+nav_order: 3
+---
+
+
+### Access Policy Middleware
+The Access Policy middleware controls route access by either allowing or denying requests based on defined rules.
+It supports two actions: `ALLOW` and `DENY`.
+
+### How It Works
+1. **Define an action:** Specify whether the middleware should `ALLOW` or `DENY` access.
+
+2. **Set sourceRanges:** Provide a list of IP addresses or IP ranges to which the policy applies. 
+
+    Requests originating from these sources will be evaluated according to the specified action.
+
+#### Example Configuration
+Here’s an example of an Access Policy middleware configuration in YAML:
+
+```yaml
+middlewares:
+  - name: access-policy
+    type: accessPolicy
+    rule:
+      action: DENY # Specify either DENY or ALLOW
+      sourceRanges:
+        - 192.168.1.1 # Single IP address
+        - 172.18.0.0-172.18.0.10 # IP range
+```