Update README.md for branch service-data

README.md

@@ -27,3 +27,9 @@ This `README.md` file may contain specific informations about the current branch
 Check the database scheme in the h2 database that was created by JPA.
 Use the h2-console application for this reason.
 http://localhost:8080/h2-console.
+
+* branch service-data
+
+ In this branch, the CommandLineRunner bean creates sample data using the service classes.
+ After startup, connect to the h2 database using the h2-console web application: http://localhost:8080/h2-console.
+ Check the data by executing some queries with the help of the console.