ajout des assets sur le repo

android/assets/Back.png

android/assets/Brick_A.png

android/assets/Brick_B.png

android/assets/Brick_C.png

android/assets/Brick_D.png

android/assets/Brick_E.png

android/assets/Brick_F.png

android/assets/Brick_G.png

android/assets/Brick_H.png

android/assets/Brick_I.png

android/assets/Exit_Z.png

android/assets/Gem_1.png

android/assets/Gem_2.png

android/assets/Idle__000.png

android/assets/Idle__001.png

android/assets/Idle__002.png

android/assets/Idle__003.png

android/assets/Idle__004.png

android/assets/Idle__005.png

android/assets/Idle__006.png