Amplify documentation and add example

[Slushee-a]

Made this merge request as mentioned in #64.

Why

Coming into the crate I wasn't sure where DisplayInterface and Rgb565 came from, as well as which modules I needed to import. Browsing through different crate docs and looking at clippy helps you figure out all of that, but adding more, and less simplified examples saves you most of that trouble.

Changes included

• Amplify (and fix) existing example on docs homepage
• Add example on docs homepage
• Add list of display-interface crates that can be used to create the DisplayInterface
• Add usage example to .orientation() and .setpixel()
• Add usage example to Builder docs page
• Add an /examples folder (Contains an example for the pi pico with the ili9341)

Could be improved:

• Missing usage example for display.set_pixels() (It's not very clear what "anything that can provide IntoIterator<Item = u16>" is supposed to be)
• Explanation on display.set_scroll_region() isn't very extensive/clear
• Another example on the /examples folder with another display, microcontroller and interface used. Could also include a more advanced drawing rather than just the whole screen being one color. A colored square would be nice.

[Slushee-a]

I see what went wrong.

1. Some code on the codeblock goes over the standard formatting limit
2. I didn't ignore the codeblocks

I will fix this in my next commit very soon

[Slushee-a]

I'm really sorry... This is embarassing. Sorry for wasting your time. Apparently it failed because some trailing spaces? otherwise I can't see what made the pipeline failed. Fixed in the latest commit.

[almindor]

I'm really sorry... This is embarassing. Sorry for wasting your time. Apparently it failed because some trailing spaces? otherwise I can't see what made the pipeline failed. Fixed in the latest commit.

No problem at all. You're giving something to improve the library, there's nothing to feel sorry or embarrased about.