Inform the user that the datamodelling tool is in an early stage

[Febakke]

Description

When we release the first version of the datamodelling tool we need to inform the user that this is not a finished version and it will change over time.

Should be a simple message visible when the user enters the tool.

Additional Information

No response

Tasks

• [ ] Design how the message should look and where it should be placed
• [ ] should it always be present or disappear at some point?
• [ ] write the text

Acceptance Criterias

No response