updates

Author: Sean-Bradley

iterator/README.md

@@ -8,4 +8,8 @@ An interface with **next** and **has_next** methods.
 
 The benefits of using the Iterator pattern is that the client, can traverse an aggregate without needing to understand it's internal representation and data structures.
 
-![Iterator Pattern UML Diagram](iterator.png)
+![Iterator Pattern UML Diagram](iterator.png)
+
+## Video Tutorial
+
+[![Iterator Design Pattern In Python](https://img.youtube.com/vi/5rRP1H4DZK4/0.jpg)](https://youtu.be/5rRP1H4DZK4)

mediator/README.md

@@ -7,3 +7,7 @@ With the mediator pattern, communication between objects is encapsulated within
 Objects communicate through the mediator rather than directly with each other.
 
 ![Mediator Pattern UML Diagram](mediator.png)
+
+## Video Tutorial
+
+[![Mediator Design Pattern In Python](https://img.youtube.com/vi/WO2d88H4_10/0.jpg)](https://youtu.be/WO2d88H4_10)

observer/README.md

@@ -4,3 +4,6 @@ The observer pattern is a software design pattern in which an object, called the
 
 ![Observer Pattern](observer.png)
 
+## Video Tutorial
+
+[![Observer Design Pattern In Python](https://img.youtube.com/vi/KAwOtYk7QSE/0.jpg)](https://youtu.be/KAwOtYk7QSE)

prototype/README.md

@@ -15,3 +15,6 @@ the copy method you use works as you expect.
 
 ![Prototype UML Diagram](prototype.png)
 
+## Video Tutorial
+
+[![Prototype Design Pattern In Python](https://img.youtube.com/vi/_jBjhI6-VDI/0.jpg)](https://youtu.be/_jBjhI6-VDI)

proxy/README.md

@@ -16,4 +16,9 @@ Object Augmentation
 
 ![Proxy Pattern UML Diagram](proxy.png)
 
+## Video Tutorial
+
+[![Proxy Design Pattern In Python](https://img.youtube.com/vi/YD38-BFvBIg/0.jpg)](https://youtu.be/YD38-BFvBIg)
+
+