build server and use app middilware

#24

src/app.js

@@ -0,0 +1,30 @@
+const express = require('express');
+const app = express();
+
+const hbars = require('express-handlebars');
+
+const path = require('path');
+const routes = require('./controllers');
+
+const favicon = require('serve-favicon');
+const bodyparser = require('body-parser');
+
+app.use(bodyparser.json());
+app.use(bodyparser.urlencoded({ extended: false }));
+
+app.use(express.static(path.join(__dirname,'..','public')));
+app.set('views', path.join(__dirname,'views'));
+app.set('view engine','hbs');
+app.engine('hbs',hbars({
+  extname:'hbs',
+  layoutsDir:path.join(__dirname, 'views','layouts'),
+  partialsDir:path.join(__dirname, 'views', 'partials'),
+  defaultLayout:'main',
+}));
+
+app.set('port',process.env.PORT || 4000);
+// app.use(favicon(path.join(__dirname, '..', 'public','img',)));
+app.use(routes);
+
+
+module.exports = app;

src/index.js

@@ -0,0 +1,5 @@
+const app = require('./app');
+
+app.listen(app.get('port'),() => {
+  console.log(`the server work on port ${app.get('port')}`);
+})