Add wall color picker demo

src/views/colorpicker/ColorPickerDemo.vue

@@ -16,6 +16,16 @@
                 <h5>Overlay</h5>
                 <ColorPicker v-model="color2" />
             </div>
+
+            <div class="card">
+                <h5>Wall Color</h5>
+                <div class="flex flex-column align-items-center md:flex-row md:align-items-start">
+                    <ColorPicker v-model="color3" :inline="true" />
+                    <div :style="wallStyle" class="mt-5 md:mt-0 md:ml-5 inline-flex">
+                        <img alt="room" src="demo/images/interior.png" class="w-full md:auto">
+                    </div>
+                </div>
+            </div>
         </div>
 
         <ColorPickerDoc />
@@ -29,7 +39,15 @@ export default {
     data() {
         return {
             color1: null,
-            color2: '1976D2'
+            color2: '1976D2',
+            color3: '474747'
+        }
+    },
+    computed: {
+        wallStyle() {
+            return {
+                backgroundColor: '#' + this.color3
+            }
         }
     },
     components: {