added factory pattern

pypatterns/creational/factory.py

@@ -0,0 +1,21 @@
+from abc import abstractmethod, ABCMeta
+
+
+class Factory(object, metaclass=ABCMeta):
+    """
+    Abstract Factory Class.
+
+    All Factories should inherit this class and overwrite the create method.
+    """
+
+    @abstractmethod
+    def create(self, **kwargs):
+        """
+        Abstract create method.
+
+        Concrete implementations should return a new instance of the object the factory class is responsible for.
+        @param kwargs: Arguments for object creation.
+        @return: A new instance of the object the factory is responsible for.
+        """
+        pass
+