instruction for localhost ngd

ngd/README.md

@@ -9,7 +9,7 @@ See [Build release binaries](../README.md#build-release-binaries) in the main pa
 ### For a localhost server: The first start will create an invitation for the admin, so you can create your wallet
 
 ```
-ngd --save-key -l 1440 --invite-admin
+ngd --save-key -l 1440 --invite-admin --save-config
 ```
 
 this will give you a link that you should open in your web browser. If there are many links, choose the one that starts with `http://localhost:`.
@@ -18,6 +18,12 @@ The computer you use to open the link should have direct access to the ngd serve
 
 Follow the steps on the screen to create your wallet :)
 
+for the next start of ngd :
+
+```
+ngd
+```
+
 ### For a server behind a domain: create the first admin user
 
 The current directory will be used to save all the config, keys and storage data.