Add markdown-in-js example (#3410)

examples/with-markdown/.babelrc

@@ -0,0 +1,4 @@
+{
+    "presets": ["next/babel"],
+    "plugins": ["markdown-in-js/babel"]
+}

examples/with-markdown/package.json

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+{
+  "name": "with-markdown",
+  "version": "1.0.0",
+  "scripts": {
+    "dev": "next",
+    "build": "next build",
+    "start": "next start"
+  },
+  "dependencies": {
+    "markdown-in-js": "1.1.3",    
+    "next": "latest",
+    "react": "^16.0.0",
+    "react-dom": "^16.0.0"
+  },
+  "license": "ISC"
+}

examples/with-markdown/pages/index.js

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+import markdown from 'markdown-in-js'
+
+// For more advanced use cases see https://github.com/threepointone/markdown-in-js
+
+export default () => <div>{markdown`
+## This is a title
+
+This is a paragraph
+`}</div>

examples/with-markdown/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/with-markdown)
+
+# With Markdown example
+
+## How to use
+
+### Using `create-next-app`
+
+Download [`create-next-app`](https://github.com/segmentio/create-next-app) to bootstrap the example:
+
+```
+npm i -g create-next-app
+create-next-app --example with-markdown with-markdown
+```
+
+### Download manually
+
+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/with-markdown
+cd with-markdown
+```
+
+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
+
+This example shows the most basic idea behind implementing [markdown-in-js](https://github.com/threepointone/markdown-in-js), a library that allows you to write markdown that transpiles to React components *at build time*.