Glossary.md

+To be sure to speak the same language throughout the documentation, you'll find any tricky vocabulary on this graphic glossary. 
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+![Glossaire-doc_1](uploads/93e59fc5d2a1a8e2b1a87ec6428c9ca5/Glossaire-doc_1.jpg)
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+If you want to update it, [here is the original draw](https://docs.google.com/drawings/d/1R_AN-sXIirtXvIr3DYlqHNnR-JZYpNxyQcvAi2MHK64/edit?usp=sharing).
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