Add services docs for image entity

source/_integrations/image.markdown

@@ -23,3 +23,37 @@ In addition, the entity can have the following states:
 
 - **Unavailable**: The entity is currently unavailable.
 - **Unknown**: The state is not yet known.
+
+### Actions
+
+Once loaded, the `image` platform will expose services that can be called to perform various actions.
+
+Available services: `snapshot`.
+
+#### Action `snapshot`
+
+Take a snapshot from an image.
+
+| Data attribute | Optional | Description                                                                    |
+| -------------- | -------- | ------------------------------------------------------------------------------ |
+| `entity_id`    | no       | Name(s) of entities to create a snapshot from, e.g., `image.my_image`.         |
+| `filename`     | no       | Snapshot file name                                                             |
+
+The path part of `filename` must be an entry in the `allowlist_external_dirs` in your [`homeassistant:`](/docs/configuration/basic/) section of your `configuration.yaml` file.
+
+For example, the following action in an automation would take a snapshot from "yourimage" and save it to /tmp with a timestamped filename.
+
+{% raw %}
+
+```yaml
+actions:
+  - variables:
+      entity_id: image.yourimage  # Store the camera entity_id in a variable for reuse
+  - action: image.snapshot
+    target:
+      entity_id: '{{ entity_id }}'
+    data:
+      filename: '/tmp/{{ entity_id }}_{{ now().strftime("%Y%m%d-%H%M%S") }}.jpg'
+```
+
+{% endraw %}