Add more themes

[iamrahatul]

Hi. Thank you for this beautiful app.
Would you mind adding more themes in this app? Default colors look a bit dull to me.
You could use - Dots, Dracula, Sakura, Monokai, Nord, Rama, Olivia and etc.

Here you can see what colors I'm talking about in the themes option - https://typings.gg

[iSoron]

Thank you for the suggestion, @iamrahatul. Pull requests adding more themes are welcome, although I am not planning to work on this myself.