lua_ls: fix vim global not found

vimrc.lua

@@ -194,6 +194,23 @@ end
 
 require('lspconfig').lua_ls.setup({
 	single_file_support = true,
+	settings = {
+		Lua = {
+			diagnostics = {
+				globals = { 'vim' },
+			},
+			runtime = {
+				version = 'LuaJIT',
+				path = vim.split(package.path, ';'),
+			},
+			workspace = {
+				library = {
+					[vim.fn.expand('$VIMRUNTIME/lua')] = true,
+					[vim.fn.expand('$VIMRUNTIME/lua/vim/lsp')] = true,
+				},
+			},
+		},
+	},
 })
 
 require('lspconfig').verible.setup({