Add extension https://github.com/Sonicblaston62/Sprite-Walls

[UnsignedArduino]

GitHub repo: https://github.com/Sonicblaston62/Sprite-Walls
Forum post: https://forum.makecode.com/t/sprite-walls-engine-extension/33627?u=unsignedarduino
Demo: [INSERT DEMO LINK - NOT REQUIRED]
Description: [INSERT SHORT DESCRIPTION THAT IS SIMILAR TO CURRENT DESCRIPTIONS OF EXTENSIONS - REQUIRED]

[UnsignedArduino]

demo https://forum.makecode.com/t/sprite-walls-engine-extension/33627/36?u=unsignedarduino