Add README

Some context about the next-on-netlify-demo and a link to the page on 
Netlify.

Author: FinnWoelm

README.md

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+# README
+
+This is a demo of a NextJS application with Server-Side Rendering (SSR).
+
+View the demo: [https://next-on.netlify.com](https://next-on.netlify.com)
+
+The demo is hosted on Netlify. Minimal configuration required thanks to [the next-on-netlify npm package](https://www.npmjs.com/package/next-on-netlify). next-on-netlify makes server-side rendering possible by using Netlify functions under the hood.
+
+Get started with next-on-netlify: [https://github.com/FinnWoelm/next-on-netlify#installation](https://github.com/FinnWoelm/next-on-netlify#installation)