Font, icons, color-scheme and status-line

doc/neovim/2 - Font, icons, color-schema and status-line.md

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+## 2.1 - Font
+
+The font we use in neovim is one from the [nerd]() font collection. Those fonts contain special characters used as an icon in NeoVim. "SauceCodePro NF" is a derivation of the "SourceCodePro" font.
+
+`lua/roka/core/options.lua`
+```lua
+vim.opt.guifont = { "SauceCodePro NF:h11:#e-subpixelantialias:#h-none" }
+```
+
+## 2.2 - Icons
+
+The various icons can be used by many plugins, example _nvim-tree_ or _lualine_.
+
+`lua/roka/core/plugins.lua`
+```lua
+return require('packer').startup(function()
+    -- other plugins...
+    
+	use "kyazdani42/nvim-web-devicons"
+    
+    -- other plugins...
+end)
+```
+
+## 2.3 - Color-scheme
+
+`lua/roka/core/plugins.lua`
+```lua
+return require('packer').startup(function()
+    -- other plugins...
+    
+	use { "bluz71/vim-nightfly-colors", as = "nighfly" }
+	use { "bluz71/vim-moonfly-colors",  as = "moonfly" }
+    
+    -- other plugins...
+end)
+```
+`lua/roka/plug/color.lua`
+
+`init.lua`
+```lua
+    -- other requires
+    
+    require( "roka.plug.color")
+    
+    -- other requires
+```
+
+## 2.4 - LuaLine
+
+`lua/roka/core/plugins.lua`
+```lua
+return require('packer').startup(function()
+    -- other plugins...
+    
+	use "nvim-lualine/lualine.nvim"
+    
+    -- other plugins...
+end)
+```
+
+`lua/roka/plug/lualine.lua`
+```lua
+local status, lualine = pcall( require, "lualine")
+if not status then
+  return
+end
+
+local lualine_nightfly = require("lualine.themes.nightfly")
+
+local new_colors = {
+  blue    = "#65D1FF",
+  green   = "#3EFFDC",
+  violet  = "#FF61EF",
+  yellow  = "#FFDA7B",
+  black   = "#000000",
+}
+
+lualine_nightfly.normal.a.bg  = new_colors.blue
+lualine_nightfly.insert.a.bg  = new_colors.green
+lualine_nightfly.visual.a.bg  = new_colors.violet
+
+lualine_nightfly.command = {
+  a = {
+    gui = "bold",
+    bg  = new_colors.yellow,
+    fg  = new_colors.black,
+  },
+}
+
+lualine.setup({
+  options = {
+    theme = lualine_nightfly
+  }
+})
+```
+
+`init.lua`
+```lua
+    -- other requires
+    
+    require( "roka.plug.lualine")
+    
+    -- other requires
+```