Add example of Nodemon on a custom server (#3374)

examples/custom-server-nodemon/README.md

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+[![Deploy to now](https://deploy.now.sh/static/button.svg)](https://deploy.now.sh/?repo=https://github.com/zeit/next.js/tree/master/examples/custom-server-nodemon)
+
+# Custom server with Nodemon example
+
+## How to use
+
+Download the example [or clone the repo](https://github.com/zeit/next.js):
+
+```bash
+curl https://codeload.github.com/zeit/next.js/tar.gz/master | tar -xz --strip=2 next.js-master/examples/custom-server-nodemon
+cd custom-server-nodemon
+```
+
+Install it and run:
+
+```bash
+npm install
+npm run dev
+```
+
+Deploy it to the cloud with [now](https://zeit.co/now) ([download](https://zeit.co/download))
+
+```bash
+now
+```
+
+## The idea behind the example
+
+The example shows how you can apply [Nodemon](https://nodemon.io/) to a custom server to have live reload of the server code without being affected by the Next.js universal code.

examples/custom-server-nodemon/nodemon.json

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+{
+  "watch": ["server/**/*.js"]
+}

examples/custom-server-nodemon/package.json

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+{
+  "scripts": {
+    "dev": "nodemon server/index.js",
+    "build": "next build",
+    "start": "NODE_ENV=production node server/index.js"
+  },
+  "dependencies": {
+    "next": "^4.1.4",
+    "react": "^16.2.0",
+    "react-dom": "^16.2.0"
+  },
+  "devDependencies": {
+    "nodemon": "^1.12.1"
+  }
+}

examples/custom-server-nodemon/pages/a.js

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+import React from 'react'
+
+export default () => <div>a</div>

examples/custom-server-nodemon/pages/b.js

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+import React from 'react'
+
+export default () => <div>b</div>

examples/custom-server-nodemon/pages/index.js

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+import React from 'react'
+import Link from 'next/link'
+
+export default () => (
+  <ul>
+    <li><Link href='/b' as='/a'><a>a</a></Link></li>
+    <li><Link href='/a' as='/b'><a>b</a></Link></li>
+  </ul>
+)

examples/custom-server-nodemon/server/index.js

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+const { createServer } = require('http')
+const { parse } = require('url')
+const next = require('next')
+
+const port = parseInt(process.env.PORT, 10) || 3000
+const dev = process.env.NODE_ENV !== 'production'
+const app = next({ dev })
+const handle = app.getRequestHandler()
+
+app.prepare()
+.then(() => {
+  createServer((req, res) => {
+    const parsedUrl = parse(req.url, true)
+    const { pathname, query } = parsedUrl
+
+    if (pathname === '/a') {
+      app.render(req, res, '/b', query)
+    } else if (pathname === '/b') {
+      app.render(req, res, '/a', query)
+    } else {
+      handle(req, res, parsedUrl)
+    }
+  })
+  .listen(port, (err) => {
+    if (err) throw err
+    console.log(`> Ready on http://localhost:${port}`)
+  })
+})