ch11: updated README.md

Author: ramalho

11-pythonic-obj/README.md

@@ -1,3 +1,6 @@
-# The Python Data Model
+# A Pythonic Object
 
 Sample code for Chapter 11 of _Fluent Python 2e_ by Luciano Ramalho (O'Reilly, 2020)
+
+The _memtest.py_ script takes a module name in the command line and loads it.
+Assuming the module defines a class named `Vector`, _memtest.py_ creates a list with 10 million instances, reporting the memory usage before and after the list is created.