document new skybell camera options (#7849)

source/_components/camera.skybell.markdown

@@ -24,3 +24,45 @@ Once you have enabled the [Skybell component](/components/skybell), add the foll
 camera:
   - platform: skybell
 ```
+
+{% configuration %}
+monitored_conditions:
+  description: The camera images to display. Default is `avatar`. The full list is `avatar`, `activity`.
+  required: false
+  type: list
+avatar_name:
+  description: Name to append to the device name for the avatar image. Default is empty string.
+  required: false
+  type: string
+activity_name:
+  description: Name to append to the device name for the last activity image. Default is empty string.
+  required: false
+  type: string
+{% endconfiguration %}
+
+## {% linkable_title Camera Types %}
+
+There are two available camera types "Avatar", which is the default, displays the Skybell avatar image.
+It is periodically updated with a fresh image. The other type is "Activity", which displays a snapshot from
+the latest event (motion, bell, or on demand) captured by the camera. You may show either camera, or both, by
+specifying its name under monitored_condtions. It's recommended, but not required, to set either avatar_name or activity_name
+if you are showing both cameras so you can tell them apart. The name will be appended to the skybell device name.
+
+
+```yaml
+# Example configuration.yaml with both images
+camera:
+  - platform: skybell
+    monitored_conditions:
+    - avatar
+    - activity
+    activity_name: "Last Activity"
+```
+
+```yaml
+# Example configuration.yaml with just last activity image
+camera:
+  - platform: skybell
+    monitored_conditions:
+    - activity
+```