Adds neotree file explorer

lua/options.lua

@@ -46,3 +46,9 @@ vim.o.completeopt = 'menuone,noselect'
 -- NOTE: You should make sure your terminal supports this
 vim.o.termguicolors = true
 
+-- Number of spaces that a <Tab> in the file counts for
+vim.opt.tabstop = 4
+-- Number of spaces to use for each step of (auto)indent
+vim.opt.shiftwidth = 4
+-- Use spaces instead of tabs
+vim.opt.expandtab = true