A simple webhook + n8n guide

docs/WEBHOOK_N8N.md

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+### Create a simple n8n workflow
+![n8n workflow](https://i.imgur.com/2EGrQjt.png)
+
+### Specify your email template 
+See [sample JSON](https://github.com/jokob-sk/Pi.Alert/blob/main/docs/webhook_json_sample.json) if you want to see the JSON paths used in the email template below
+![Email template](https://i.imgur.com/kcVjGm1.png)
+
+### Get your webhook in n8n
+![n8n webhook URL](https://i.imgur.com/clN8eE5.png)
+
+### Configure PiAlert to point to the above URL
+![PiAlert config](https://i.imgur.com/rowJCC7.png)