Create README.md

README.md

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+<p align="center">
+  <a href="https://github.com/homebridge/homebridge"><img src="https://raw.githubusercontent.com/homebridge/branding/master/logos/homebridge-color-round-stylized.png" height="140"></a>
+</p>
+
+<span align="center">
+
+# homebridge-co
+
+
+</span>
+
+## Description
+
+This plugin shows a CO air quality accessory that will trigger when then threshold is met - Carbon monoxide ( CO ) NOT carbon dioxide( Co2 )
+
+Example config:
+```
+{
+  "accessories": [
+    {
+      "accessory": "COSensor",
+      "name": "CO Sensor",
+      "url": "http://10.1.1.145",
+      "threshold": 50,
+      "pollingInterval": 60,
+      "coLevelPath": "co_level"
+    }
+  ]
+}
+
+```
+
+
+response must be JSON default path is {"co_level": xx.xx}
+