Feature request: user-added color schemes

[salperinlea]

[x] Feature request: I'd really like to be able to add my own color scheme to the app, so that it fits aesthetically with the rest of my workflow. Though the built in options are extensive, none of them fit well with the color scheme I use for everything else (tokyo night); the option to add new color schemes through the app -- or even just instructions as to where these are stored, so i can add one myself -- would be great.