Add CONTRIBUTING document

CONTRIBUTING.rst

@@ -0,0 +1,38 @@
+contributing
+------------
+
+in order for a pull request to be merged, please make sure it meets the following criteria:
+
+1. all unit tests pass for all supported versions of python and django.
+2. every newly added line of code is exercised by at least one unit test.
+3. all code is compliant with PEP8 style conventions.
+
+
+development setup
+-----------------
+to setup a development environment, run the following commands::
+
+  $ pip install -r dev_requirements.txt
+
+
+unit testing
+------------
+
+to run the unit tests, run the following commands::
+
+  $ cd test_app
+  $ python manage.py test
+
+
+demo testing
+------------
+
+to ensure the app behaves as expected, run the following::
+
+  $ cd test_app
+  $ python manage.py runserver
+
+then, visit ``http://localhost:8000/`` in your browser and confirm it produces a valid CSV.
+
+
+

README.rst

@@ -88,3 +88,9 @@ views.py::
       return render_to_csv_response(people, delimiter='|')
 
 For more details on possible arguments, see the documentation on `DictWriter <https://docs.python.org/2/library/csv.html#csv.DictWriter>`_.
+
+
+development and contributions
+-----------------------------
+
+Please read the included ``CONTRIBUTING.rst`` file.