feat(sge): add doc for testing user invoices

docs/konnectors/enedis-sge.md

@@ -110,6 +110,12 @@ Information required:
 - Postal Code
 - City
 
+#### Test with user invoices
+
+To test user invoices, you will have to make a copy of `konnector-dev-config.example.json` to `konnector-dev-config.json` and fill out informations.
+
+Then, to test the authentication flow of the konnector without fetching any data, launch the script `yarn standalone-no-data`
+
 ### Fetch Data
 
 In order to get data from the SGE API we have to request the following route :