Add support for Neotest

[antoineco]

I would like to add support for Neotest to the colorscheme, but first I wanted to gauge the interest here by sharing an autocmd which simulates the result:

vim.api.nvim_create_autocmd("ColorScheme", {
  group = vim.api.nvim_create_augroup("user_nvim_init", {}),
  pattern = "mellifluous",
  callback = function()
    local colors = require "mellifluous.colors".get_colors()
    local palette = {
      ui_red = colors.ui_red.hex,
      ui_green = colors.ui_green.hex,
      ui_yellow = colors.ui_yellow.hex,
      ui_blue = colors.ui_blue.hex,
      green = colors.green.hex,
      purple = colors.purple.hex,
      yellow = colors.yellow.hex
    }

    local function set_hl(name, val)
      vim.api.nvim_set_hl(0, name, val)
    end

    set_hl("NeotestPassed", { fg = palette.ui_green })
    set_hl("NeotestFailed", { fg = palette.ui_red })
    set_hl("NeotestRunning", { fg = palette.ui_yellow })
    set_hl("NeotestSkipped", { fg = palette.ui_blue })
    set_hl("NeotestFile", { fg = palette.purple })
    set_hl("NeotestDir", { link = "Directory" })
    set_hl("NeotestAdapterName", { link = "Title" })
    set_hl("NeotestMarked", { fg = palette.green, bold = true })
    set_hl("NeotestTarget", { fg = palette.yellow })
  end
})

before

after

[antoineco]

Duplicate of #29