Mise à jour de 'README.md'

README.md

@@ -1,3 +1,25 @@
 # vhelio-simulator
 
-Vehicle energy consumption and production simulator
+Vehicle energy consumption and production simulator. This tool has been created by [Vélo solaire pour tous](https://vhelio.org/association/) for simulating the `vhélio` behavior, but is designed to be easy to adapt to other vehicles.
+
+## Using the simulator
+
+The easiest way is to use the [online simulator](https://vhelio.org/simulateur-vhelio/).
+
+You can also download the latest pre-built stand-alone version and open `www/vhelio-simulator.html` in your web browser. The program will run in your browser, but won't communicate with any server, this is a purely local application.
+
+## Building from source
+
+### Dependencies
+
+The simulator is written in `typescript`, whose compiler depends on `node.js`.
+
+The first step is to [install node.js](https://nodejs.org)
+
+Then go in the `simulator` folder and run this command: `npm install`. This will install all the npm modules listed in `package.json`, including the `typescript` compiler.
+
+### Build
+
+Execute `build.sh` on Linux, or `build.bat` on Windows.
+
+That's it, you can now open `www/vhelio-simulator.html` in your browser.