Update README.md

Author: petrknap

README.md

@@ -10,34 +10,42 @@ Enumerated type for PHP by [Petr Knap].
 
 ### Usage of php-enum
 
+#### Enum declaration
 ```php
 /**
+ * @method static DayOfWeekEnum SUNDAY()
  * @method static DayOfWeekEnum MONDAY()
  * @method static DayOfWeekEnum TUESDAY()
  * @method static DayOfWeekEnum WEDNESDAY()
  * @method static DayOfWeekEnum THURSDAY()
  * @method static DayOfWeekEnum FRIDAY()
  * @method static DayOfWeekEnum SATURDAY()
- * @method static DayOfWeekEnum SUNDAY()
  */
 class DayOfWeekEnum extends \PetrKnap\Php\Enum\AbstractEnum
 {
     protected function __construct($constantName)
     {
         self::setConstants([
-            "MONDAY" => 0,
-            "TUESDAY" => 1,
-            "WEDNESDAY" => 2,
-            "THURSDAY" => 3,
-            "FRIDAY" => 4,
-            "SATURDAY" => 5,
-            "SUNDAY" => 6
+            "SUNDAY" => 0,
+            "MONDAY" => 1,
+            "TUESDAY" => 2,
+            "WEDNESDAY" => 3,
+            "THURSDAY" => 4,
+            "FRIDAY" => 5,
+            "SATURDAY" => 6
         ]);
         parent::__construct($constantName);
     }
 }
 ```
 
+#### Enum usage
+```php
+if (date('w') == DayOfWeekEnum::FRIDAY()->getValue()) {
+    echo "Finally It's Friday!"
+}
+```
+
 
 ## How to install