mentioned installing from Composer in docs

docs/guide/installation.md

@@ -1,7 +1,23 @@
 Installation
 ============
 
-Installation of Yii mainly involves the following two steps:
+Installing via Composer
+-----------------------
+
+The recommended way of installing Yii is by using Composer package manager.
+
+There are two application templates available:
+
+- [basic](https://github.com/yiisoft/yii2-app-basic) that is just a basic frontend application template.
+- [advanced](https://github.com/yiisoft/yii2-app-advanced) that is a set of frontend, backend, console, common
+ (shared code) and environments support.
+
+Please refer to installation instructions on these pages.
+
+Installing from zip
+-------------------
+
+Installation from zip mainly involves the following two steps:
 
    1. Download Yii Framework from [yiiframework.com](http://www.yiiframework.com/).
    2. Unpack the Yii release file to a Web-accessible directory.
@@ -12,7 +28,6 @@ needs to be exposed to Web users. Other PHP scripts, including those from
 Yii, should be protected from Web access; otherwise they might be exploited
 by hackers.
 
-
 Requirements
 ------------