##UC4. Register a new user
###Main scenario
- Starts when a user wants to create login-credentials
- System ask for username and password
- User provides username and password
- System saves the credentials and presents a success message
###Alternate Scenarios
- 4a. Credentials could not be registered (Username already used, wrong username format, Wrong password format.
-
- System presents an error message
-
- Step 2 in main scenario.