Add step to fetch asset addresses in nitro-node playbook (#15)

Part of [Service Provider Setup](https://www.notion.so/Service-provider-setup-a09e2207e1f34f3a847f7ce9713b7ac5)

Co-authored-by: Adw8 <adwaitgharpure@gmail.com>
Reviewed-on: cerc-io/testnet-ops#15

user-setup/README.md

@@ -14,10 +14,11 @@
 
 ## Setup a user
 
+Execute the following commands in the `user-setup` directory
+
 - Create a new `hosts.ini` file:
 
    ```bash
-   cd user-setup/
    cp ../hosts.example.ini hosts.ini
    ```