Bunch of 2 other themes based upon dracula for marp theme

[remyd1]

Hi,

I just created two other themes from dracula.

You can test it from these URL:

• black-and-white,
• grey-cyan-white

I also updated the README because IMHO the way to create and test our own style, is not really easy with Marp.

Best regards,

[yhatt]

Dracula project hosts only one theme for all platforms, so I guess community variants would not be acceptable.

[remyd1]

Dracula project hosts only one theme for all platforms, so I guess community variants would not be acceptable.

Ok. I will continue my own fork then.

Best regards