Added movement

Welcome again folks!

On this week,  we added movement functions and some other animations. The vertical speed is slower than the horizontal one, by doing that, the game will be consistent with the beat 'em up genre. Additionally, we're using the "Streets of Fight" assets by ansimuz (https://ansimuz.itch.io/streets-of-fight) as a baseline for the game.

We also made some progress with the scenario, adding the base tile map and background.