text: var express = require('express');
  var app = express();
  
  app.get('/', (req, res, next) => {
      res.sendFile(__dirname + '/main.html');
  })
  
  app.get('/slave', (req, res, next) => {
      res.sendFile(__dirname + '/slave.html');
  })
  
  app.use(express.static('public'));
  
  app.listen(8000);