Add extension https://github.com/Brohann3214/custom-keybind-extension #203
Description
GitHub repo: https://github.com/Brohann3214/custom-keybind-extension
Forum post: https://forum.makecode.com/t/custom-keybinds-extension-aka-more-buttons/24416?u=unsignedarduino
Demo: [INSERT DEMO LINK - NOT REQUIRED]
Description: [INSERT SHORT DESCRIPTION THAT IS SIMILAR TO CURRENT DESCRIPTIONS OF EXTENSIONS - REQUIRED]