Add light effect selector example to Select.md (#301)

Added an example of a light effect selector in JSON format.

examples/Actions.md

@@ -108,3 +108,64 @@ If you would like to temporarily disable an item in your menu, e.g. for seasonal
   "enabled": false
 }
 ```
+
+# Selects
+
+Here is an example of how to make a light effect selector:
+
+```json
+{
+  "type": "group",
+  "name": "Example",
+  "title": "Light Effect",
+  "content": "{{ state_attr('light.moon', 'effect') }}",
+  "items": [
+    {
+      "type": "tap",
+      "name": "None",
+      "entity": "light.example",
+      "tap_action": {
+        "service": "light.turn_on",
+        "data": {
+          "effect": "None"
+        }
+      }
+    },
+    {
+      "type": "tap",
+      "name": "Rainbow",
+      "entity": "light.example",
+      "tap_action": {
+        "service": "light.turn_on",
+        "data": {
+          "effect": "Rainbow"
+        }
+      }
+    },
+    {
+      "type": "tap",
+      "name": "Glimmer",
+      "entity": "light.example",
+      "tap_action": {
+        "service": "light.turn_on",
+        "data": {
+          "effect": "Glimmer"
+        }
+      }
+    },
+    {
+      "type": "tap",
+      "name": "Twinkle",
+      "entity": "light.example",
+      "tap_action": {
+        "service": "light.turn_on",
+        "data": {
+          "effect": "Twinkle"
+        }
+      }
+    }
+  ]
+}
+```
+
+The same pattern works for any selector (`input_select.*`, `select.*`, `climate.*` mode).