Create image_processing.qrcode.markdown (#8208)

* Create image_processing.qrcode.markdown

for the new platform

* Minor changes

source/_components/image_processing.qrcode.markdown

@@ -0,0 +1,44 @@
+---
+layout: page
+title: "QR Code Recognition"
+description: "Instructions on how to integrate QR Code Recognition into Home Assistant."
+date: 2019-01-18 00:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: home-assistant.png
+ha_category: Image Processing
+featured: false
+ha_release: 0.87
+---
+
+The `qrcode` image processing platform enables QR code recognition from cameras.
+
+## {% linkable_title Configuration %}
+
+To enable this, add the following lines to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+image_processing:
+  - platform: qrcode
+    source:
+      - entity_id: camera.door
+```
+
+{% configuration %}
+source:
+  description: List of image sources.
+  required: true
+  type: list
+  keys:
+    entity_id:
+      description: A camera entity id to get picture from.
+      required: true
+      type: string
+    name:
+      description: This parameter allows you to override the name of your `image_processing` entity.
+      required: false
+      type: string
+{% endconfiguration %}