Add snapshot content (#936)

docs/api/supervisor/endpoints.md

@@ -1914,8 +1914,13 @@ Return a list of [Snapshot models](api/supervisor/models.md#snapshot)
       "slug": "skuwe823",
       "date": "2020-09-30T20:25:34.273Z",
       "name": "Awesome snapshot",
-      "type": "full",
-      "protected": true
+      "type": "partial",
+      "protected": true,
+      "content": {
+        "homeassistant": true,
+        "addons": ["awesome_addon"],
+        "folders": ["ssl", "media"]
+      }
     }
   ]
 }

docs/api/supervisor/models.md

@@ -175,6 +175,17 @@ These models are describing objects that are getting returned from the superviso
 | name      | string  | The name given to the snapshot                                        |
 | type      | string  | The type of snapshot (full, partial)                                  |
 | protected | boolean | `true` if the snapshot is password protected                          |
+| content | dictionary | A dictionary describing the content of the snapshot                        |
+
+### Snapshot -> content
+
+The `content` key of a snapshot object contains the following keys:
+
+| key       | type    | description                                                           |
+| --------- | ------- | --------------------------------------------------------------------- |
+| homeassistant      | boolean  | `true` if the snapshot contains homeassistant
+| addons      | list  | A list of add-on slugs included in the snapshot
+| folders      | list  | A list of folder names included in the snapshot
 
 ## Snapshot details