set up clear LibGDX project
use openGL v. 2.0
Added new screen
cleaning screen after each frame
Added world, stages and debugRenderer
Added abstract class GameElement + class LevelData
Renamed class
added level file
Added first gameElement - WoodenBox
Added first body and fixture
Added rotation handling
Created new package to store game elements
Changed names of package in yml file
Added ground
Modified ground
Added ground to level
Stage is acting