added brief descriptions of creational patterns

README.md

@@ -501,6 +501,8 @@ ___
 
 ##### Builder Pattern
 
+Separate object construction from its representation.
+
 ```python
 from pypattyrn.creational.builder import Builder, Director
 
@@ -569,6 +571,8 @@ print(repr(house))    #Floor: More than one | Size: Small
 
 ##### Factory Pattern
 
+An interface for creating an object.
+
 ```python
 from pypattyrn.creational.factory import Factory  # This is just an interface
 
@@ -607,6 +611,8 @@ dog.speak()  # 'woof'
 
 ##### Abstract Factory Pattern
 
+Create an instance from a family of factories.
+
 ```python
 from pypattyrn.creational.factory import Factory, AbstractFactory
 
@@ -687,6 +693,8 @@ fly.fly()  # 'fly'
 
 ##### Object Pool Pattern
 
+Provide a pool of instantiated objects which can be checked out and returned rather than creating new objects all the time.
+
 ```python
 from pypattyrn.creational.pool import Reusable, Pool
 
@@ -723,6 +731,8 @@ assert dog_one.sound == dog_four.sound
 
 ##### Prototype Pattern
 
+Clone an object to produce new objects.
+
 ```python
 from pypattyrn.creational.prototype import Prototype
 
@@ -760,6 +770,8 @@ assert point_four.distance_to(point_three) == 0
 
 ##### Singleton Pattern
 
+Ensure that only a single instance of a class exists.
+
 ```python
 from pypattyrn.creational.singleton import Singleton