Add a point-form overview of how file doubles solve a problem.
tree03456a17695987d0f7afdf34e37f19a2fb890257
-rw-r--r-- 57 .gitignore
-rw-r--r-- 1109 CHANGES
-rw-r--r-- 62 CONTRIBUTORS
-rw-r--r-- 35147 LICENSE.GPL-3
-rw-r--r-- 2457 README
drwxr-xr-x - doc
drwxr-xr-x - gajja
-rw-r--r-- 3250 setup.py
drwxr-xr-x - test