document the use of yapf for formatting

README.md

diff --git a/README.md b/README.md
index 9c4b47f..5d94ebe 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,24 @@
 Organization Adminstrators can find their API key on their
 [User Profile](https://codein.withgoogle.com/).
 
+# Code Style
+
+We follow the [Google Python Style
+Guide](https://google.github.io/styleguide/pyguide.html) with a few
+modifications to match the *Google internal* version.  The primary one is the
+use of 2 space indents.
+
+Use [yapf](https://github.com/google/yapf) to keep the code formatted nicely.
+You can set up an auto-save hook in your editor, or run it manually:
+
+```shell
+# one time setup:
+pip install yapf
+
+# format files:
+yapf -i *.py
+```
+
 # Bugs/Support
 
 To report bugs, please email [gci-support@google.com](mailto:gci-support@google.com).

sample.csv

diff --git a/sample.csv b/sample.csv
index 2d28d29..c6677df 100644
--- a/sample.csv
+++ b/sample.csv
@@ -1,2 +1,7 @@
 name,description,max_instances,mentors,tags,is_beginner,categories,time_to_complete_in_days,private_metadata
-"Test Task","Long Description",3,"mentor1@example.org,mentor2@example.org","a,b",yes,"1,2",5,private
+"Test Redder","Long Description",3,"ospotest2@gmail.com,ospotest4@gmail.com","a,b",yes,"1,2",5,private
+"Test Bluer","Long Description",3,"ospotest2@gmail.com,ospotest4@gmail.com","a,b",yes,"1,2",5,private
+"Test Greener","Long Description",3,"ospotest2@gmail.com,ospotest4@gmail.com","a,b",yes,"1,2",5,private
+"Test Oranger","Long Description",3,"ospotest2@gmail.com,ospotest3@gmail.com","a,b",no,"1,2",5,private
+"Test Pinker","Long Description",3,"ospotest2@gmail.com,ospotest3@gmail.com","a,b",no,"1,2",5,private
+