Add config_flow to shopping_list (home-assistant#12226)

source/_integrations/shopping_list.markdown

@@ -5,12 +5,24 @@ logo: home-assistant.png
 ha_category:
   - Intent
 ha_release: '0.50'
+ha_config_flow: true
 ha_quality_scale: internal
 ---
 
 The `shopping_list` integration allows you to keep track of shopping list items. Includes the ability to add items via your voice using the sentence "Add eggs to my shopping list".
 
-## Configuration
+## Configuration - GUI
+
+From the Home Assistant front page go to **Configuration** and then select **Integrations** from the list.
+
+Use the plus button in the bottom right to add a new integration called **Shopping List**.
+
+In the popup:
+- Submit
+
+The success dialog will appear or an error will be displayed in the popup.
+
+## Configuration - Manual
 
 ```yaml
 # Example configuration.yaml entry