improved extensions readme

README.md

@@ -1,15 +1,13 @@
 Twitter Bootstrap Extension for Yii 2
 =====================================
 
-This is the Twitter Bootstrap extension for Yii 2. It encapsulates Bootstrap components
+This is the Twitter Bootstrap extension for Yii 2. It encapsulates [Bootstrap](http://getbootstrap.com/) components
 and plugins in terms of Yii widgets, and thus makes using Bootstrap components/plugins
-in Yii applications extremely easy. For example, the following
-single line of code in a view file would render a Bootstrap Progress plugin:
-
-```php
-<?= yii\bootstrap\Progress::widget(['percent' => 60, 'label' => 'test']) ?>
-```
+in Yii applications extremely easy.
 
+This repository is a git submodule of <https://github.com/yiisoft/yii2>.
+Please submit issue reports and pull requests to the main repository.
+For license information check the [LICENSE](LICENSE.md)-file.
 
 Installation
 ------------
@@ -19,14 +17,23 @@ The preferred way to install this extension is through [composer](http://getcomp
 Either run
 
 ```
-php composer.phar require --prefer-dist yiisoft/yii2-bootstrap "*"
+php composer.phar require --prefer-dist yiisoft/yii2-bootstrap
 ```
 
 or add
 
 ```
-"yiisoft/yii2-bootstrap": "*"
+"yiisoft/yii2-bootstrap": "~2.0.0"
 ```
 
 to the require section of your `composer.json` file.
 
+Usage
+----
+
+For example, the following
+single line of code in a view file would render a Bootstrap Progress plugin:
+
+```php
+<?= yii\bootstrap\Progress::widget(['percent' => 60, 'label' => 'test']) ?>
+```