Add everforest.json (Everforest Medium Dark theme)

[n1yn]

New Preset: Everforest Medium Dark (everforest.json)

Description

Everforest is a green based color scheme; it's designed to be warm and soft in order to protect your eyes.

Palette

reference: sainnhe/everforest and sainhe contribution guide

Screenshots (optional)

Wallpaper

Checklist

Before submitting the PR, I checked:

• [x] I've only modified one preset
• [ ] I've added the URL to my raw preset in presets.json
• [x] I've checked the format of each json files I modified
• [x] (optional) I've added screenshots
• [x] The preset name is following preset naming guidelines.

Publication

• [x] I want to add my preset in the preset list.

Thanks for your submission we will review and merge it as quick as possible.