Feature/filestorage securityservices create (#132)

* sfs: Add support for security services Create

* sfs: Add acceptance tests for security service Create

* sfs: Fix comments
diff --git a/openstack/sharedfilesystems/v2/securityservices/urls.go b/openstack/sharedfilesystems/v2/securityservices/urls.go
new file mode 100644
index 0000000..ba0ae6d
--- /dev/null
+++ b/openstack/sharedfilesystems/v2/securityservices/urls.go
@@ -0,0 +1,7 @@
+package securityservices
+
+import "github.com/gophercloud/gophercloud"
+
+func createURL(c *gophercloud.ServiceClient) string {
+	return c.ServiceURL("security-services")
+}