add cheatsheet datatable_fr (#586) in French

retrieved initial work .pdf .pptx <!-- Thank you for contributing a cheatsheet! 🎉 Cheatsheets are usually added in bursts so don't worry if your pull request sits for a little bit! Please fill out whichever section is relevant below and feel free to delete the irrelevant option. --> <!-- NEW OR UPDATED CONTRIBUTED CHEAT SHEETS --> <!-- Please fill out the fields below: --> ## Contributed Cheatsheet Information Cheatsheet Name: datatable_fr 1 sentence description of the contents: datatable cheatsheet french version Your Name (as you want to be credited on the website): Christian Wia A link to your github/website (optional): https://github.com/ChristianWia/ A link to relevant package documentation (optional): Date created/updated (Month YYYY format): August 2024 <!-- Please keep the below portion in your pull request, and check `[x]` the applicable boxes. --> #### Please be sure you've included the [Creative Commons License](https://creativecommons.org/licenses/by/4.0/): - [x] Add CC-BY-SA Your Name to copywrite under the Creative Commons on the cheatsheet #### Check that you have done the following: - [x] Used descriptive file names, something like package-name.pdf or task-name.pdf and did not include "cheatsheet" in the title. - [x ] Included a PDF file of entire cheatsheet. - [x ] Included a PNG file of the first page size 1100 x 850 in the pngs folder (for the website thumbnail). - [x] Included a Keynote or PowerPoint or similar file in the relevant folder (helps translators who want to translate your cheatsheet). <!-- NEW OR UPDATED TRANSLATIONS --> <!-- Please fill out the fields below: --> ## Translated Cheatsheet Information Cheatsheet Name: datatable_fr Language: french Your Name (as you want to be credited on the website): Christian Wia Date created/updated (Month YYYY format): August 2024 <!-- Please keep the below portion in your issue, and check `[x]` the applicable boxes. --> #### Check that you have done the following: - [x] Added the [language abbreviation](https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes) to the file name (ex. data-transformation_es.pdf). - [x] Included a PDF file of your translated cheatsheet to the translation folders. - [x] Included a Keynote or PowerPoint file for your translated cheatsheet to the translation folder. - [x] Not duplicated an existing translation. If an existing translation exists, I have edited it.