Added Facade UML

Structural/Facade/README.md

@@ -15,3 +15,7 @@ That's why a good facade has no `new` in it. If there are multiple creations for
 
 The best facade has no `new` and a constructor with interface-type-hinted parameters.
 If you need creation of new instances, use a Factory as argument.
+
+## UML Diagram
+
+![Alt Facade UML Diagram](uml/uml.png)

Structural/Facade/uml/uml.txt

@@ -0,0 +1,20 @@
+@startuml
+interface BiosInterface {
+    +execute()
+    +waitForKeyPress()
+    +launch(OsInterface $os)
+    +powerDown()
+}
+
+class Facade {
+    #$os : OsInterface
+    #$bios : BiosInterface
+    +__construct(BiosInterface $bios, OsInterface $os)
+    +turnOn()
+    +turnOff()
+}
+
+interface OsInterface {
+    +halt()
+}
+@enduml