Add missing demo

packages/docs/src/en/directives/model.md

@@ -268,6 +268,20 @@ Colors: <span x-text="colors"></span>
 Color: <span x-text="color"></span>
 ```
 
+<!-- START_VERBATIM -->
+<div class="demo">
+    <div x-data="{ color: '' }">
+        <select x-model="color">
+            <template x-for="color in ['Red', 'Orange', 'Yellow']">
+                <option x-text="color"></option>
+            </template>
+        </select>
+
+        <div class="pt-4">Color: <span x-text="color"></span></div>
+    </div>
+</div>
+<!-- END_VERBATIM -->
+
 <a name="modifiers"></a>
 ## Modifiers