Feature Reuqest: Material gruvbox color scheme.

[pedrohba1]

The Material variant looks really nice, I would like it to match my terminal color scheme and the gruvbox variant is a little bit off if I enable it.

Any tips on contributing to a new theme?

The theme source for colors:

https://github.com/sainnhe/gruvbox-material

[bobthecow]

I'd start by making a custom color scheme and using it for a while. Once you're happy with it, add it to the wiki or open a PR :)