Add documentation for sony_projector switch component (#8390)

* Add documentation for sony_projector switch component

* ⬆️ ha_release 0.89

source/_components/switch.sony_projector.markdown

@@ -0,0 +1,39 @@
+---
+layout: page
+title: "Sony Projector Switch"
+description: "Instructions on how to integrate Sony Projector switches into Home Assistant."
+date: 2019-01-01 07:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: sony.png
+ha_category: Multimedia
+ha_iot_class: "Local Polling"
+ha_release: 0.89
+---
+
+The `sony_projector` switch platform allows you to control the state of SDCP compatible network-connected projectors from [Sony](http://www.sony.com).
+
+## {% linkable_title Configuration %}
+
+To use your Sony Projector in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+switch:
+  - platform: sony_projector
+    host: "192.168.1.47"
+    name: "Projector"
+```
+
+{% configuration %}
+host:
+  description: The hostname or IP address of the projector.
+  required: true
+  type: string
+name:
+  description: The name to use when displaying this switch.
+  required: false
+  type: string
+{% endconfiguration %}