docs: added Ping Only Device (#7687)

* docs: Adding Device - Ping Only Device

* image for adding ping only device

* Update Adding-a-Device.md

* Update Adding-a-Device.md

* Update Adding-a-Device.md

doc/Support/Adding-a-Device.md

@@ -1,5 +1,7 @@
 source: Support/Adding-a-Device.md
 
+# Adding Device
+
 You have two options for adding a new device into LibreNMS. You can add a device via the `cli` or by using the 
 `WebUI`.
 
@@ -26,6 +28,17 @@ As an example, if your device is configured to use the community `my_company` us
 
 ![Add device](/img/webui_add_device.png)
 
+### Ping Only Device
+
+You can add ping only devices into LibreNMS through the WebUI. When adding the device switch the SNMP button to "off".
+Device will be added into LibreNMS as Ping Only Device and will show ICMP Response Graph. 
+
+- Hostname: IP address or DNS name.
+- Hardware: Optional you can type in whatever you like.
+- OS: Optional this will add the Device's OS Icon.
+
+![Ping Only](/img/add-ping-only.png)
+
 If you would like to add devices automatically then you will probably want to read the [Auto-discovery Setup](/Extensions/Auto-Discovery.md) guide.
 
-You may also want to add devices programatically, if so, take a look at our [API documentation](/API/#function-add_device)
+You may also want to add devices programatically, if so, take a look at our [API documentation](../API/index.md#function-add_device)