add go.nvim and gopls settings

lua/custom/plugins/go-nvim.lua

@@ -0,0 +1,14 @@
+return {
+  'ray-x/go.nvim',
+  dependencies = { -- optional packages
+    'ray-x/guihua.lua',
+    'neovim/nvim-lspconfig',
+    'nvim-treesitter/nvim-treesitter',
+  },
+  config = function()
+    require('go').setup()
+  end,
+  event = { 'CmdlineEnter' },
+  ft = { 'go', 'gomod' },
+  build = ':lua require("go.install").update_all_sync()', -- if you need to install/update all binaries
+}