Finished configuration chapter.

docs/guide/README.md

@@ -27,6 +27,7 @@ Getting Started
 Basic Concepts
 --------------
 
+* [Components](basic-components.md)
 * [Properties](basic-properties.md)
 * [Events](basic-events.md)
 * [Behaviors](basic-behaviors.md)

docs/guide/basic-components.md

+Components
+==========
+
+> Note: This chapter is under development.
+
+
+Object Configuration
+--------------------
+
+The [[yii\base\Object|Object]] class introduces a uniform way of configuring objects. Any descendant class
+of [[yii\base\Object|Object]] should declare its constructor (if needed) in the following way so that
+it can be properly configured:
+
+```php
+class MyClass extends \yii\base\Object
+{
+    public function __construct($param1, $param2, $config = [])
+    {
+        // ... initialization before configuration is applied
+
+        parent::__construct($config);
+    }
+
+    public function init()
+    {
+        parent::init();
+
+        // ... initialization after configuration is applied
+    }
+}
+```
+
+In the above example, the last parameter of the constructor must take a configuration array
+which contains name-value pairs that will be used to initialize the object's properties at the end of the constructor.
+You can override the `init()` method to do initialization work after the configuration is applied.
+
+By following this convention, you will be able to create and configure new objects
+using a configuration array like the following:
+
+```php
+$object = Yii::createObject([
+    'class' => 'MyClass',
+    'property1' => 'abc',
+    'property2' => 'cde',
+], [$param1, $param2]);
+```

docs/guide/structure-entry.md

+Entry Scripts
+=============
+
+> Note: This chapter is under development.
+
+Configuring options in the bootstrap file
+-----------------------------------------
+
+For each application in Yii there is at least one bootstrap file: a PHP script through which all requests are handled. For web applications, the bootstrap file is  typically `index.php`; for
+console applications, the bootstrap file is `yii`. Both bootstrap files perform nearly the same job:
+
+1. Setting common constants.
+2. Including the Yii framework itself.
+3. Including [Composer autoloader](http://getcomposer.org/doc/01-basic-usage.md#autoloading).
+4. Reading the configuration file into `$config`.
+5. Creating a new application instance, configured via `$config`, and running that instance.
+
+Like any resource in your Yii application, the bootstrap file can be edited to fit your needs. A typical change is to the value of `YII_DEBUG`. This constant should be `true` during development, but always `false` on production sites.
+
+The default bootstrap structure sets `YII_DEBUG` to `false` if not defined:
+
+```php
+defined('YII_DEBUG') or define('YII_DEBUG', false);
+```
+
+During development, you can change this to `true`:
+
+```php
+define('YII_DEBUG', true); // Development only
+defined('YII_DEBUG') or define('YII_DEBUG', false);
+```