Added GPU simulation

Add reference to the new "CPU Simulator" image select

Added a "CPU Simulator" image more appropriate for light-mode

Added another option to previously mentioned sentence

Add sentence to README.md about Ctrl-Shift combination

Slight correction on Live Demo

Put Live Demo example programs in separate js file

Added Examples button description to README.md

Added resetCPU to Live Demo example prog. loading

Added example programs to Live Demo (index.html)

Delete images/.gitkeep

Delete contrib/.gitkeep

Delete examples/.gitkeep

Create .editorconfig

Adding the main files