Create gameover scene

[davcri]

We want to create a GameOver scene that should be displayed on gameover.

This scene should contain:

1. The current score of the player
2. A button (that will be used in another issue to restart the game) Done in master branch

In the future it would be nice to have players insert their name when finishing the game (like old arcade games).

[javieracevedo]

I wanna try this one.

[davcri]

@javieracevedo I updated the description, someone already pushed some code to the master branch, check it out!

[Thomazino]

I want to contribute on this one too plz

[davcri]

Sure @Thomazino! Keep in mind that we already have a GameOver scene, so we just need the score to be displayed!

Feel free to ask any question if you need clarification!