php yii: add page (#2347)

pages/common/php-yii.md

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+# php yii
+
+> Yii Framework's command line interface.
+
+- Display a list of all available commands:
+
+`php yii {{help}}`
+
+- Start PHP's built-in web server for the current Yii application:
+
+`php yii {{serve}}`
+
+- Generate a controller, views and related files for the CRUD actions on the specified model class:
+
+`php yii {{gii/crud}} --modelClass={{ModelName}} --controllerClass={{ControllerName}}`