Adding doc.go files for packages
diff --git a/openstack/identity/v2/extensions/doc.go b/openstack/identity/v2/extensions/doc.go
new file mode 100644
index 0000000..791e4e3
--- /dev/null
+++ b/openstack/identity/v2/extensions/doc.go
@@ -0,0 +1,3 @@
+// Package extensions provides information and interaction with the
+// different extensions available for the OpenStack Identity service.
+package extensions