Add a README to graylog/nodejs

Author: Bacto

graylog/nodejs/README.md

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+# Graylog / NodeJS
+
+This is a simple example of how to use Graylog in a few minutes.
+
+
+First, you have to create an input in Graylog.
+
+Go to your Graylog interface, in `System`, `Inputs`. In `Select input`, choose the `GELF UDP` one.
+
+Set the title to "GELF UDP" and valid it.
+
+
+GELF means "Graylog Extended Log Format". It was created by Graylog and is perfect for this example and probably for your needs.
+
+
+Then you can now explore the file `app.js`, modify it and test it :)
+
+
+That's it, you're ready to log everything!