README Registry

Registry/README.md

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+# Registry
+
+## Purpose
+
+To implement a central storage for objects often used throughout the application, is typically implemented using
+an abstract class with only static methods (or using the Singleton pattern)
+
+## Examples
+
+* Zend Framework: `Zend_Registry` holds the application's logger object, front controller etc.
+* Yii Framework: `CWebApplication` holds all the application components, such as `CWebUser`, `CUrlManager`, etc.