Readme.so is a Next.js web application that provides an online editor for generating README.md files. Users can select from predefined sections, edit their content using a Monaco Editor (desktop) or textarea (mobile), reorder sections via drag-and-drop, and download the final markdown. The application state is managed in React and persisted to localStorage with debounced saving. The frontend uses TailwindCSS for styling and integrates libraries like dnd-kit for drag-and-drop and react-markdown for preview. The app is statically exported and deployed via GitHub Pages.