update README

Author: mikeizbicki

README.md

@@ -10,6 +10,10 @@ In this assignment, you will learn how to load data into postgres much faster us
 1. batch loading (i.e. running the INSERT command on more than one row at a time)
 1. and parallel loading.
 
+You will also get practice doing the type of medium sized refactor on code that you didn't write that is common in industry.
+
+<img src=refactor.jpg width=400px />
+
 ## Tasks
 
 ### Setup