Feat: claude command for new article formatting

Author: Samuelfaure

.claude/commands/add_article.md

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+Here is an article I wrote. Format it in a style that is consistent with the other articles in the repository. You can read the other articles for reference.
+
+Choose the category it belongs to and place it in the appropriate folder. Also update docs/.vuepress/config.js to include the new article in the sidebar, and the appropriate index file at the root of the docs/ folder.
+Every article title starts with an emoji, use one that is appropriate.
+
+Be sure to include in the article the "title, description, footer" section like in other articles in the repository. The footer never change.