Added some documentation

Author: jaydouble

README.md

@@ -7,4 +7,38 @@ With this command you can setup a notification for PRTG
 
 ```
 PRTGNotificationHomeAssistant.exe --key "long generated key" -u "http://homeassisanturl" -l "light.noc" -c %colorofstate -s %sensorid
-```
+```
+
+Setup PRTG
+- First create a notification Template
+	- Sign in to PRTG 
+	- Goto setup -> account settings -> Notification Templates
+	- Create a new template with the following settings:
+		- Basic Settings
+			- Template Name (something meaningfull for you)
+			- Status: Started
+		- Notification Summarization
+			- Method: Always notify ASAP, never summarize
+		- Enable Execute Program
+			- Program File: Select PRTGNotificationHomeAssistant.bat
+			- Parameters: --key "KEY" -u "HASS URL" -l "LIGHT" -c "%colorofstate" -s %sensorid
+				- the KEY is set in Home Assistant
+				- the HASS URL is the plain URL of you Home Assistant
+				- the LIGHT is the entity_id of you light (or Hue group) that should react on the notification
+				- %colorofstate is a PRTG variable (please don't change)
+				- %sensorid is a PRTG variable (please don't change)
+	- now click Save
+	- then you will have something like: ![Settings](https://raw.githubusercontent.com/jaydouble/PRTGNotificationHomeAssistant/master/doc/notification%20settings.png "PRTG Notification Settings")
+- then set the notification trigger
+	- Sign in to PRTG
+	- Goto Devices -> Notification Triggers
+		- Creating a trigger use the settings:
+			- When sensor state is Down for at least 0 seconds, perform (You beautifull naming of the template you created)
+			- When sensor state is Down for at least 300 seconds, perform (You beautifull naming of the template you created) and repeat every 0 minutes 
+			- When sensor leaves Down state after a notification was triggered, perform (You beautifull naming of the template you created)
+		- repeat this for 
+			- Warning
+			- Unusual
+			- Unknown
+			- Up
+	- and you will have something like: ![Triggers](https://raw.githubusercontent.com/jaydouble/PRTGNotificationHomeAssistant/master/doc/notification%20triggers.png "PRTG Notification Truggers")