New introduction screens

[MichaelMiljanovic]

New screens should be made to introduce the new game elements at each stage.

[MichaelMiljanovic]

The current introduction screen for level 4 is incorrect and references the wrong task.

[niranjangirhe]

Fixed the incorrect information. New introduction for each level will be added soon

[MichaelMiljanovic]

Awaiting new introductions for each level