Added cube prefab and mat

Assets/Resources/Cubes.meta

Assets/Resources/Cubes/LargeCube(1).prefab

Assets/Resources/Cubes/LargeCube(1).prefab.meta

Assets/Resources/Cubes/LargeCube(2).prefab

Assets/Resources/Cubes/LargeCube(2).prefab.meta

Assets/Resources/Cubes/LargeCube.prefab

Assets/Resources/Cubes/LargeCube.prefab.meta

Assets/Resources/Cubes/MatGreen.mat

Assets/Resources/Cubes/MatGreen.mat.meta

Assets/Resources/Cubes/MatMagenta.mat

Assets/Resources/Cubes/MatMagenta.mat.meta

Assets/Resources/Cubes/MatRed.mat

Assets/Resources/Cubes/MatRed.mat.meta

Assets/Resources/Cubes/MediumCube(1).prefab

Assets/Resources/Cubes/MediumCube(1).prefab.meta

Assets/Resources/Cubes/MediumCube(2).prefab

Assets/Resources/Cubes/MediumCube(2).prefab.meta

Assets/Resources/Cubes/MediumCube.prefab

Assets/Resources/Cubes/MediumCube.prefab.meta

Assets/Resources/Cubes/SmallCube(1).prefab