Update README with binary sensor documentation and badge example

README.md

@@ -47,6 +47,14 @@ For each server (243 and 244), the following sensors are created:
   - Unit: °C
   - Update interval: 30 seconds
 
+### Binary Sensors (Status Monitoring)
+
+- **Server 243 Status** (`binary_sensor.server_243_status`)
+  - Monitors online/offline state of Server 243
+  - Uses ping to check availability
+  - Update interval: 60 seconds
+  - Perfect for adding a status badge to your dashboard
+
 ### Requirements
 
 - OpenHardwareMonitor must be running on both servers with web server enabled
@@ -77,12 +85,18 @@ To add additional sensors, you can follow the same template pattern and navigate
 - Verify OpenHardwareMonitor detects your GPU
 - Check if the GPU sensor name matches the template pattern
 
+**Status sensor not working:**
+- Ensure ICMP (ping) is allowed through any firewalls
+- Check Home Assistant logs for ping binary_sensor errors
+
 ### Example Dashboard Card
 
 ```yaml
 type: entities
 title: Server Hardware Monitoring
 entities:
+  - entity: binary_sensor.server_243_status
+    name: Server 243 Status
   - entity: sensor.server_243_cpu_temperature
     name: Server 243 CPU Temp
   - entity: sensor.server_243_cpu_load
@@ -101,6 +115,14 @@ entities:
     name: Server 244 GPU Temp
 ```
 
+### Example Badge Card for Status
+
+```yaml
+type: badge
+entity: binary_sensor.server_243_status
+name: Server 243
+```
+
 ## License
 
 This configuration is provided as-is for personal use.