Add readme with setup environment documentation.

README.rst

@@ -0,0 +1,13 @@
+Greenmine Backend
+=================
+
+
+Setup development environment.
+------------------------------
+
+.. code-block:: console
+
+    pip install -r requirements.txt
+    python manage.py syncdb --migrate --noinput
+    python manage.py loaddata initial_user
+    python manage.py sample_data