Added more documentation to install steps

Details.md

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+# Details for Home Assistant beginners
+If you can reach your Home Assistant at [http://homeassistant.local:8123](http://homeassistant.local:8123) the links below should work.
+
+## Mosquitto  
+Head over to Supervisor -> Add-on Store and search for `mosquitto broker`.  
+Install it and then start  [mosquito addon link](http://homeassistant.local:8123/hassio/addon/core_mosquitto/info)  
+
+
+## Add api user for Mosquito
+Add a Home Assistant user for the Plejd addon to be able to connect to Mosquito [Configuration -> Users](http://homeassistant.local:8123/config/users)  
+Call the user e.g. `mqtt-api-user`, set a password and save
+
+## Plejd
+Follow the `Easy Installation` in [README.MD](plejd/README.md)  
+And `Configuration Parameters` on the same page.  
+The only parameters needing a value are  
+  * site
+  * username
+  * password
+  * mqttUsername e.g. `mqtt-api-user`
+  * mqttPassword
+
+Now you can start the Plejd add-on
+
+## Where are the lights?
+Head over to [Configuration -> Integrations](http://homeassistant.local:8123/config/integrations) and click Configure on MQTT  
+After this step a new `Mosquito broker` should appear on the same page. If everything was setup correctly. It will list your lights under
+`1 entity`/`n entities`