Add ability to create custom buttons to change slide to next and previous.

[vikaskrsharma]

It is a very useful component to be used but as it doesn't have any support to add custom buttons to change slide. i will not be able to use it. These buttons are very useful on desktop websites as touch is rarely accessible there. i can find any props using which i can implement this functionality.

[vikaskrsharma]

I can work on this feature. You can assign it to me if available