Document options and callbacks that can be used

[toymachiner62]

There should be documentation on the options and callbacks that can be used. By searching through the code I was able to find that I can customize the searchDelay and displayText.

[axel-zarate]

Completed in commit c8d13d19822e8693cf8ab75cfc1a1291211084e0

[toymachiner62]

Your options table is great. One thing i would suggest is to add the callback signature so implementers know what parameters the callback takes.