add IdP service restart hint

Thank you Scott Rollins (Indica Labs) for pointing out that the identity provider service needs to be restarted before the newly created client can be authenticated!

README.md

@@ -6,7 +6,7 @@ Image transfer tool for Indica Labs' HALO  🤌
 >```terminal
 >"C:\Program Files\Indica Labs\Identity Provider\IndicaLabs.ApplicationLayer.Halo.IdentityProvider.exe" reconfigure --script AddResearchServiceClient "client_type=Italo;scopes=serviceuser|graphql"
 >```
->The configuration details required for Italo to communicate with HALO's GraphQL API server can then be found on the HALO server system with the Identity Provider's config file:
+>Details for the newly created service client can then be found on the HALO server system with the Identity Provider's config file:
 >
 >`C:\ProgramData\Indica Labs\Configuration\IndicaLabs.ApplicationLayer.Halo.IdentityProvider\local-production.yml`
 >```YAML
@@ -19,6 +19,8 @@ Image transfer tool for Indica Labs' HALO  🤌
 >    secrets:
 >    - secret: [GraphQL client secret]
 >```
+>However, the creation of new service clients won't come into effect until the corresponding Windows service has been restarted: Either restart the HALO server system or open the "Services" application to restart the service: Select the "HALO Identity Provider" service and restart the service from either the service description on the left (hyperlink) or from the drop-down menu (right-click).
+>
 >Notice: The `[GraphQL client name]` is composed of the service client name `Italo`, an underscore `_`, and the `[GraphQL server name]`.
 
 >[!WARNING]