docs(api): Add credentials of default keycloak user

In a docker compose set-up, a local Keycloak instance
is started. Added the username and password of the
default user that, when authenticated, can be used
to call endpoints on the REST api.

Signed-off-by: Wolfgang Klenk <[email protected]>

Author: wkl3nk

README.md

@@ -97,13 +97,13 @@ without TLS.**
 
 ### Accessing the services
 
-| Service        | URL                              | Credentials       |
-|----------------|----------------------------------|-------------------|
-| ORT Server API | http://localhost:8080/swagger-ui |                   |
-| Keycloak       | http://localhost:8081            | admin:admin       |
-| PostgreSQL     | http://localhost:5433            | postgres:postgres |
-| RabbitMQ       | http://localhost:15672           | admin:admin       |
-| Graphite       | http://localhost:8888            | root:root         |
+| Service        | URL                              | Credentials                                             |
+|----------------|----------------------------------|---------------------------------------------------------|
+| ORT Server API | http://localhost:8080/swagger-ui |                                                         |
+| Keycloak       | http://localhost:8081            | Administrator: admin:admin<br/>User: ort-admin:password |
+| PostgreSQL     | http://localhost:5433            | postgres:postgres                                       |
+| RabbitMQ       | http://localhost:15672           | admin:admin                                             |
+| Graphite       | http://localhost:8888            | root:root                                               |
 
 #### HTTP request collections