Update README.md

iluwatar · iluwatar · commit 6246ed6d266d · 2014-08-22T21:33:20.000+03:00
diff --git a/README.md b/README.md
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 ##Mediator
 **Intent:** Define an object that encapsulates how a set of objects interact. Mediator promotes loose coupling by keeping objects from referring to each other explicitly, and it lets you vary their interaction independently.
+
+##Memento
+**Intent:** Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later.
+
