Update README

Author: ELC

README.md

@@ -1,5 +1,16 @@
 # Python Design Patterns
 
+This repo is a collection of non-trivial examples of several design patterns
+implemented in different ways. Its aim is to contrast *traditional* (i.e. GoF)
+design patterns with more Pythonic equivalents.
+
+The notion of being Pythonic is indeed subjective and it is used in the sense
+of leveraging built-in Python features such as Protocols, Callable classes,
+closures, partial evaluation, generators, decorators, first-class functions and
+so on.
+
+Each pattern has an independent README linked below with a guide to highlight
+differences between implementation details.
 
 ## Patterns