update readme

README.md

@@ -1,7 +1,7 @@
 Yii 2 Basic Application Template
 ================================
 
-Yii 2 Basic Application Template is a skeleton Yii 2 application best for
+Yii 2 Basic Application Template is a skeleton [Yii 2](http://www.yiiframework.com/) application best for
 rapidly creating small projects.
 
 The template contains the basic features including user login/logout and a contact page.