Add demo hass config to repo

hass_conf/configuration.yaml

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+homeassistant:
+  name: Demo IoT
+  latitude: 48.7667
+  longitude: 9.1833
+  elevation: 0
+  unit_system: metric
+  time_zone: Europe/Berlin
+  customize: !include customize.yaml
+
+
+introduction: # Show links to resources in log and frontend
+frontend: # Enables the frontend
+config: # Enables configuration UI
+history: # Enable sensor history
+updater: # Checks for available updates
+hassio: # App store
+
+group: !include groups.yaml
+automation: !include automations.yaml
+script: !include scripts.yaml
+
+# Run local mosquito broker
+mqtt:
+  broker: localhost
+  port: 1883
+  username: your_mqtt_user
+  password: your_mqtt_pw
+
+# MQTT sensors
+sensor: 
+ -  platform: mqtt
+    name: "Humidity (Sensor ID)"
+    state_topic: "sensor/sensor_id/humidity"
+    qos: 0
+    unit_of_measurement: "%"
+    
+ -  platform: mqtt
+    name: "Absolute Humidity (Sensor ID)"
+    state_topic: "sensor/sensor_id/abs_humidity"
+    qos: 0
+    unit_of_measurement: "gr/m3"
+

hass_conf/lovelace.yaml

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+title: Demo IoT
+views:
+  - badges:
+      - sensor.temperature_sensor_id
+    path: default_view
+    title: Home
+  - cards:
+      - cards:
+          - aspect_ratio: 100%
+            entities:
+              - sensor.temperature_sensor_id
+            hours_to_show: 3
+            refresh_interval: 30
+            title: Temperature (3h)
+            type: history-graph
+          - entities:
+              - sensor.humidity_sensor_id
+            hours_to_show: 3
+            refresh_interval: 30
+            title: Humidity (3h)
+            type: history-graph
+          - entities:
+              - sensor.absolute_sensor_id
+            hours_to_show: 3
+            refresh_interval: 30
+            title: Absolute Humidity (3h)
+            type: history-graph
+          - entities:
+              - sensor.air_quality_sensor_id
+            hours_to_show: 3
+            refresh_interval: 30
+            title: Air Quality (3h)
+            type: history-graph
+        type: vertical-stack
+    panel: true
+    path: graph_view_3
+    title: Graphs (3h)
+  - cards:
+      - cards:
+          - aspect_ratio: 100%
+            entities:
+              - sensor.temperature_sensor_id
+            hours_to_show: 12
+            refresh_interval: 30
+            title: Temperature (12h)
+            type: history-graph
+          - entities:
+              - sensor.humidity_sensor_id
+            hours_to_show: 12
+            refresh_interval: 30
+            title: Humidity (12h)
+            type: history-graph
+          - entities:
+              - sensor.absolute_humidity_sensor_id
+            hours_to_show: 12
+            refresh_interval: 30
+            title: Absolute Humidity (12h)
+            type: history-graph
+          - entities:
+              - sensor.air_quality_sensor_id
+            hours_to_show: 12
+            refresh_interval: 30
+            title: Air Quality (12h)
+            type: history-graph
+        type: vertical-stack
+    panel: true
+    path: graph_view_12
+    title: Graphs (12h)
+