I know how to switch markdown color theme, but how about adding new one <img width="652" alt="Screen Shot 2019-06-20 at 8 58 02 PM" src="https://user-images.githubusercontent.com/538657/59854979-354f0e00-939e-11e9-9dc6-0e93ec635505.png"> <img width="570" alt="Screen Shot 2019-06-20 at 8 58 14 PM" src="https://user-images.githubusercontent.com/538657/59854983-36803b00-939e-11e9-937c-d52952db5d79.png"> I've got 6 themes in there, how would you add more?
