Add screenshot placeholders

Author: sergey-goncharenko

README.md

@@ -76,6 +76,16 @@ dry_run: false
 core_stop_confirmation: "STOP_CORE"
 ```
 
+## Screenshots
+
+### Nightly Core maintenance
+
+![Nightly maintenance window configuration](docs/screenshots/config-nightly-maintenance.png)
+
+### Daily emergency SSH window
+
+![Emergency SSH window configuration](docs/screenshots/config-emergency-ssh-daily.png)
+
 ## Add-ons in this repository
 
 | Add-on | Description |

docs/screenshots/README.md

@@ -0,0 +1,10 @@
+# Screenshots
+
+Drop public-facing screenshots for the repository README in this folder.
+
+Expected files:
+
+- `config-nightly-maintenance.png` — the main nightly Core maintenance window with selected days.
+- `config-emergency-ssh-daily.png` — the emergency SSH window with no selected days, showing the daily default.
+
+Keep screenshots focused on the add-on configuration UI. Avoid including hostnames, tokens, private URLs, device names, or other sensitive Home Assistant data.