Solarized theme

[drhcr]

Is your feature request related to a problem? Please describe.
No, low priority feature request.

Describe the solution you'd like
A theme based on Solarized colors.

Describe alternatives you've considered
Using other theme. As a light user, Sunset/Outrun as they are the only themes without white background.

Additional context
Solarized color could be an alternative to have themes with less contrast.

For example :
Light
--app-primary: #b58900;
--app-background: #fdf6e3;
--app-inset-item-background: #eee8d5;
--app-tab-bar-background: #eee8d5;

Dark
--app-primary: #b58900;
--app-background: #002b36;
--app-inset-item-background: #073642;
--app-tab-bar-background: #073642;