Add README

README.md

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+
+# Variables
+
+    # The port n8n should be made available on
+    N8N_PORT=5678
+
+    # This ones are currently only important for the webhook URL creation.
+    # So if "WEBHOOK_TUNNEL_URL" got set they do get ignored. It is however
+    # encouraged to set them correctly anyway in case they will become
+    # important in the future.
+    N8N_PROTOCOL=https
+    N8N_HOST=n8n.example.com
+
+    # The IP address n8n should listen on
+    N8N_LISTEN_ADDRESS=1.1.1.1
+
+    export VUE_APP_URL_BASE_API=https://n8n.example.com/
+
+## Dokku 
+
+dokku config:set $app --no-restart N8N_PORT=5678
+
+
+
+## Reference
+
+* https://docs.n8n.io/reference/configuration.html