Update Readme.md

[DellaRaccoon]

The readme file needs to be updated with some useful diagrams and better explanations of how to use the library.

AC

• "How do they work?" is expanded and diagrams added
• "Wiring" is expanded and diagrams added
• "How do i use this library?" is expanded

[DellaRaccoon]

"How do they work?" is expanded and diagrams added ✔️