Updating zigbee2mqttassistant documentation

docs/Zigbee2mqttassistant.md

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+# Zigbee2Mqtt Assistant
+## References
+- [Docker](https://hub.docker.com/r/carldebilly/zigbee2mqttassistant)
+- [Website](https://github.com/yllibed/Zigbee2MqttAssistant/blob/master/README.md)
+
+## About
+
+This service a web frontend which displays Zigbee2Mqtt service messages and able to control it over Mqtt. For the 
+servie a working Mqtt server is required and that have to be configured.
+
+## Environment Parameters
+
+Z2MA_SETTINGS__MQTTSERVER=mosquitto  - The mqtt service instance which is used by Zigbee2Mqtt instance.
+Z2MA_SETTINGS__MQTTUSERNAME=<optional> - When mqtt server have authentication this user is used.
+Z2MA_SETTINGS__MQTTPASSWORD=<optional> - When mqtt server have authentication this user is used.
+TZ=Europe/Budapest <optional> - Recommmended to setup for correct timestamps.
+
+## Accessing the UI
+The  Zigbee2Mqtt Assistant UI is available using port 8880 (http://your.local.ip.address:8880/)
+