Add French 🇫🇷 language support

Topic

I would like to offer my contribution as a translator to make the p5.js website accessible in French. As a front-end developer with a solid background in web development and French as my first language, I'm motivated by the idea of making this fantastic tool more accessible to the French-speaking community and especially to curious young people who don't necessarily have a good grounding in English to enable them to read the documentation properly and make to more accessible to them. However, I am aware that doing this work alone will be a complicated task. That's why I'm calling on other French speakers who might be interested in this work to draw up a roadmap and ensure that the work is carried out with maximum quality assurance. Thanks 👋