Added DependencyInjection UML

Structural/DependencyInjection/README.md

@@ -14,3 +14,7 @@ Notice we are following Inversion of control principle in `Connection` by asking
 
 * The Doctrine2 ORM uses dependency injection e.g. for configuration that is injected into a `Connection` object. For testing purposes, one can easily create a mock object of the configuration and inject that into the `Connection` object
 * Symfony and Zend Framework 2 already have containers for DI that create objects via a configuration array and inject them where needed (i.e. in Controllers)
+
+## UML Diagram
+
+![Alt DependencyInjection UML Diagram](uml/uml.png)

Structural/DependencyInjection/uml/uml.txt

@@ -0,0 +1,28 @@
+@startuml
+abstract class AbstractConfig {
+    #$storage
+    +__construct($storage)
+}
+
+class ArrayConfig {
+    +get($key : string|int, $default = null)
+    +set($key : string|int, $value : mixed)
+}
+
+class Connection {
+    #$configuration : Parameters
+    #$host
+    +__construct(Parameters $config)
+    +connect()
+    +getHost()
+}
+
+interface Parameters {
+    +get($key : string|int)
+    +set($key, $value : mixed)
+}
+
+AbstractConfig <|.. ArrayConfig
+Parameters <|.. ArrayConfig
+
+@enduml