Create example in README.md

[micdah]

Just a quick demo of how to setup, and some sensible default options.

[mookid8000]

On a scale from 0 to 100 % percent done, where would you estimate the doneness of this task?

[==============================================]
0 % done                              100 % done
/\
||

Feel free to move the arrow to the right level of doneness.

[mookid8000]

If you prefer, you can report progress using the following checkmark-based progress device:

• 0 % done
• 10 % done
• 20 % done
• 30 % done
• 40 % done
• 50 % done
• 60 % done
• 70 % done
• 80 % done
• 90 % done
• 100 % done

Check/uncheck those that apply.