Added NodeJS Express instructions

nodejs-express/README.md

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+# "Hello World" in NodeJS using Express
+
+It's using the Express framework, one of the most frequently used, lightweight web frameworks for NodeJS.
+
+## Prerequisites
+* [NodeJS](https://nodejs.org/en/download/)
+* npm (if it's not bundled with NodeJS already)
+
+## How to install/run
+Simply run the following commands. `npm install` will locally install the dependencies. `node index.js` will start a webserver with the specified behaviour.
+
+    npm install
+    node index.js