README.md: refinement

Signed-off-by: Jérôme Benoit <jerome.benoit@sap.com>

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 ## Summary
 
-Simple node program to simulate a set of charging stations based on the OCPP-J 1.6 protocol.
+Simple [node.js](https://nodejs.org/) program to simulate a set of charging stations based on the OCPP-J 1.6 protocol.
 
 ## Start