added brief descriptions of structural patterns

README.md

@@ -809,6 +809,8 @@ ___
 
 ##### Adapter Pattern
 
+Wrap an object into an interface which the client expects. 
+
 ```python
 from pypattyrn.structural.adapter import Adapter
 
@@ -870,6 +872,8 @@ else:
 
 ##### Composite Pattern
 
+Compose objects into a tree structure of objects that can be treated uniformly.
+
 ```python
 from pypattyrn.structural.composite import Composite
 
@@ -926,6 +930,8 @@ assert not leaf_three.did_something
 
 ##### Decorator Pattern
 
+Attach additional functionality to functions.
+
 ```python
 import time
 from pypattyrn.structural.decorator import DecoratorSimple, DecoratorComplex, CallWrapper
@@ -987,6 +993,8 @@ assert (10, False) == slow_class.slow_function_false(10)
 
 ##### Flyweight Pattern
 
+Share data with other similar objects to increase efficiency.
+
 ```python
 from pypattyrn.structural.flyweight import FlyweightMeta