DOCS: pihole guide docs

Signed-off-by: jokob-sk <jokob.sk@gmail.com>

docs/PIHOLE_GUIDE.md

@@ -1,8 +1,29 @@
 # Integration with PiHole
 
-NetAlertX comes with 2 plugins suitable for integrating with your existing PiHole instance. One plugin is using a direct SQLite DB connection, the other leverages the DHCP.leases file generated by PiHole. You can combine both approaches and also supplement it with other [plugins](/docs/PLUGINS.md). 
+NetAlertX comes with 3 plugins suitable for integrating with your existing PiHole instance. The first plugin uses the v6 API, the second plugin is using a direct SQLite DB connection, the other leverages the `DHCP.leases` file generated by PiHole. You can combine multiple approaches and also supplement scans with other [plugins](/docs/PLUGINS.md).
 
-## Approach 1: `DHCPLSS` Plugin - Import devices from the PiHole DHCP leases file
+## Approach 1: `PIHOLEAPI` Plugin - Import devices directly from PiHole v6 API
+
+![PIHOLEAPI sample settings](./img/PIHOLE_GUIDE/PIHOLEAPI_settings.png)
+
+To use this approach make sure the Web UI password in **Pi-hole** is set.
+
+| Setting | Description | Recommended value |
+| :------------- | :------------- | :-------------|
+| `PIHOLEAPI_URL` | Your Pi-hole base URL including port.  | `http://192.168.1.82:9880/` |
+| `PIHOLEAPI_RUN_SCHD` | If you run multiple device scanner plugins, align the schedules of all plugins to the same value.  | `*/5 * * * *` |
+| `PIHOLEAPI_PASSWORD` | The Web UI base64 encoded (en-/decoding handled by the app) admin password. | `passw0rd` |
+| `PIHOLEAPI_SSL_VERIFY` | Whether to verify HTTPS certificates. Disable only for self-signed certificates. | `False` |
+| `PIHOLEAPI_API_MAXCLIENTS` | Maximum number of devices to request from Pi-hole. Defaults are usually fine. | `500` |
+| `PIHOLEAPI_FAKE_MAC` | Generate FAKE MAC from IP. | `False` |
+
+Check the [PiHole API plugin readme](https://github.com/jokob-sk/NetAlertX/tree/main/front/plugins/pihole_api_scan/) for details and troubleshooting.
+
+### docker-compose changes
+
+No changes needed
+
+## Approach 2: `DHCPLSS` Plugin - Import devices from the PiHole DHCP leases file
 
 ![DHCPLSS sample settings](./img/PIHOLE_GUIDE/DHCPLSS_pihole_settings.png)
 
@@ -23,7 +44,7 @@ Check the [DHCPLSS plugin readme](https://github.com/jokob-sk/NetAlertX/tree/mai
 | `:/etc/pihole/dhcp.leases` |  PiHole's `dhcp.leases` file. Required if you want to use PiHole `dhcp.leases` file. This has to be matched with a corresponding `DHCPLSS_paths_to_check` setting entry (the path in the container must contain `pihole`) |
 
 
-## Approach 2: `PIHOLE` Plugin - Import devices directly from the PiHole database
+## Approach 3: `PIHOLE` Plugin - Import devices directly from the PiHole database
 
 ![DHCPLSS sample settings](./img/PIHOLE_GUIDE/PIHOLE_settings.png)