Added decorators readme

Author: Christopher Harrison

18 - Decorators/README.md

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+# Decorators
+
+[Decorators](https://www.python.org/dev/peps/pep-0318/) are similar to attributes in that they add meaning or functionality to blocks of code in Python. They're frequently used in frameworks such as [Flask](http://flask.pocoo.org/) or [Django](https://www.djangoproject.com/). The most common interaction you'll have with decorators as a Python developer is through using them rather than creating them.
+
+``` python
+# Example decorator
+@log(True)
+def sample_function():
+    print('this is a sample function')
+```