updated the README file of the bootstrap app.

apps/bootstrap/README.md

 Yii 2 Bootstrap Application
 ===========================
 
-** NOTE ** Yii 2 and the relevant applications and extensions are still under heavy
+**NOTE** Yii 2 and the relevant applications and extensions are still under heavy
 development. We may make significant changes without prior notices. Please do not
 use them for production. Please consider using [Yii v1.1](https://github.com/yiisoft/yii)
-which is production ready.
+if you have a project to be deployed for production soon.
 
 
 Thank you for choosing Yii 2 - the new generation of high-performance PHP framework.
@@ -37,4 +37,25 @@ The minimum requirement by Yii is that your Web server supports PHP 5.3.?.
 INSTALLATION
 ------------
 
+### Install via Composer
 
+If you do not have [Composer](http://getcomposer.org/), you may download it from
+[http://getcomposer.org/](http://getcomposer.org/) or run the following command on Linux/Unix/MacOS:
+
+~~~
+curl -s http://getcomposer.org/installer | php
+~~~
+
+You can then install the Bootstrap Application using the following command:
+
+~~~
+php composer.phar create-project --stability=dev yiisoft/yii2-bootstrap bootstrap
+~~~
+
+Now you should be able to access the Bootstrap Application using the URL `http://localhost/bootstrap/www/`,
+assuming `bootstrap` is directly under the document root of your Web server.
+
+
+### Install from an Archive File
+
+This is not currently available. We will provide it when Yii 2 is formally released.