Update documentation for Harman Kardon component

source/_components/harman_kardon_avr.markdown

@@ -46,9 +46,52 @@ port:
   required: false
   default: 10025
   type: integer
+key_interval:
+  description: The interval between the keys to send, to stabilise the http requests.
+  required: false
+  default: 0.2
+  type: small_float
+simulate_volume_set:
+  description: Act as if the volume can be set on the receiver. This can be usefull to integrate with the Google Assistant to control the volume. The volume returned is always 0.5
+  required: false
+  default: False
+  type: boolean
+sources:
+  description: List of sources to be able to control
+  required: false
+  default: STB, Radio, TV, Game, AUX
+  type: list
+  keys:
+    name:
+      description: The visible source input to choose from
+      required: true
+      type: string
+    source:
+      description: The name of the source as the receiver would understand
+      required: false
+      type: string
+      default: Defaults to the name of the source
 {% endconfiguration %}
 
 A few notes:
 
 - The newest firmware automatically shuts down the AVR after a certain amount of time. The AVR is then not available on the network anymore, so the 'on' command will not work.
 - The AVR has no endpoints to determine the volume, muted, playing etc., so if the remote control is used, HA will not know the new states of the device.
+
+Full example:
+
+```yaml
+# Example configuration.yaml entry
+media_player:
+  - platform: harman_kardon_avr
+    name: NAME
+    host: IP_ADDRESS
+    port: 10025
+    key_interval: 0.2
+    simulate_volume_set: False
+    sources:
+      - name: Television
+        source: TV
+      - name: Xbox One
+        source: Game
+```