Document prerequisites installation

Signed-off-by: Jérôme Benoit <jerome.benoit@piment-noir.org>

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 Simple [node.js](https://nodejs.org/) program to simulate a set of charging stations based on the OCPP-J 1.6 protocol.
 
+## Prerequisites
+
+### Windows
+
+* [Chocolatey](https://chocolatey.org/):
+
+```powershell
+choco install -y nodejs-lts
+```
+
+### MacOSX
+
+* [Homebrew](https://brew.sh/):
+
+```shell
+brew install node@14
+```
+
 ## Configuration syntax
 
 All configuration files are in the JSON standard format.