How can i add black and white color ?
As the project stands right now, you can't. I'm open to suggestions/pull requests though as long as it stays within the same spirit.
i made a pull request ( #4 ) to add this.
Is this issue solved? I need to add black and white color.
You can use the pull request by @dredenba or one of the forks of the project that adds Black & White. I'm not sure about adding this to the main-line without significantly changing the look/feel. Here are some of the forks: https://github.com/dredenba/DKVerticalColorPicker https://github.com/abrahamhunt/DKVerticalColorPicker