Add usage in readme

.gitignore

+# phpstorm project files
+.idea
+
+# netbeans project files
+nbproject
+
+# zend studio for eclipse project files
+.buildpath
+.project
+.settings
+
+# windows thumbnail cache
+Thumbs.db
+
+# composer vendor dir
+/vendor
+
+# composer itself is not needed
+composer.phar
+composer.lock
+
+# Mac DS_Store Files
+.DS_Store
+
+# phpunit itself is not needed
+phpunit.phar
+# local phpunit config
+/phpunit.xml

README.md

@@ -5,3 +5,34 @@ Soft delete behavior for Yii2
 Installation
 ------------
 
+The preferred way to install this extension is through [composer](http://getcomposer.org/download/).
+
+Either run
+
+```
+php composer.phar require --prefer-dist vyants/yii2-softdelete "*"
+```
+
+or add
+
+```
+"vyants/yii2-softdelete": "*"
+```
+
+to the require section of your `composer.json` file.
+
+Usage
+-----
+
+ ```
+ public function behaviors() {
+      return [
+          'softDelete' => ['class' => 'vyants\softdelete\SoftDelete',
+              'statusAttribute' => 'status',
+              'timeAttribute' => false,
+              'deletedValue' => -1,
+              'activeValue' => 1,
+          ],
+      ];
+ }
+ ```
\ No newline at end of file