Add google.oauth2.flow - utility for doing OAuth 2.0 Authorization Flow (#100)

diff --git a/docs/reference/google.oauth2.flow.rst b/docs/reference/google.oauth2.flow.rst
new file mode 100644
index 0000000..bae5408
--- /dev/null
+++ b/docs/reference/google.oauth2.flow.rst
@@ -0,0 +1,7 @@
+google.oauth2.flow module
+=========================
+
+.. automodule:: google.oauth2.flow
+    :members:
+    :inherited-members:
+    :show-inheritance: