Add google.auth.jwt (#7)

diff --git a/docs/reference/google.auth.jwt.rst b/docs/reference/google.auth.jwt.rst
new file mode 100644
index 0000000..79e3080
--- /dev/null
+++ b/docs/reference/google.auth.jwt.rst
@@ -0,0 +1,7 @@
+google.auth.jwt module
+======================
+
+.. automodule:: google.auth.jwt
+    :members:
+    :undoc-members:
+    :show-inheritance: