Add CourseCreator services definition and tests

[rgomezcasas]

This was missing from #15

We need:

• Services definitions for that pr
• Behaviour tests
• Integration test for the repository
• Some behat test for the new endpoint

[stale]

Issue automatically set as Stale after 30 days of inactivity. It will be closed in 7 days if we don't move it forward. We would like to maintain the repo as clean as possible. Thanks for your comprehension 👼

[stale]

Issue automatically set as Stale after 30 days of inactivity. It will be closed in 7 days if we don't move it forward. We would like to maintain the repo as clean as possible. Thanks for your comprehension 👼

[JavierCane]

Mr. @Stale bot, we really appreciate your work. However, it would be nice to maintain this very specific issue open. Would it be posible?

Thx!

PS: We should add some kind of Backlog label in order to avoid automatically flagging these issues as Stale 😅